Adding MAINTAINERS and CONTRIBUTING guidelines for DCO

CONTRIBUTING.md

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+- [Contributing to the OpenSearch K8S Operator](#contributing)
+  - [First Things First](#first-things-first)
+  - [Ways to Contribute](#ways-to-contribute)
+    - [Feature Requests](#feature-requests)
+    - [Contributing Code](#contributing-code)
+  - [Developer Certificate of Origin](#developer-certificate-of-origin)
+  - [Review Process](#review-process)
+
+# Contributing to the OpenSearch K8S Operator
+
+The OpenSearch K8S Operator is a community project that is built and maintained by people just like **you**. We're glad you're interested in helping out. There are several different ways you can do it, but before we talk about that, let's talk about how to get started.
+
+## First Things First
+
+1. **When in doubt, open an issue** - For almost any type of contribution, the first step is opening an issue. Even if you think you already know what the solution is, writing down a description of the problem you're trying to solve will help everyone get context when they review your pull request. If it's truly a trivial change (e.g. spelling error), you can skip this step -- but as the subject says, when in doubt, [open an issue](https://github.com/Opster/opensearch-k8s-operator/issues).
+
+2. **Only submit your own work**  (or work you have sufficient rights to submit) - Please make sure that any code or documentation you submit is your work or you have the rights to submit. We respect the intellectual property rights of others, and as part of contributing, we'll ask you to sign your contribution with a "Developer Certificate of Origin" (DCO) that states you have the rights to submit this work and you understand we'll use your contribution. There's more information about this topic in the [DCO section](#developer-certificate-of-origin).
+
+## Ways to Contribute
+
+
+### Feature Requests
+
+If you've thought of a way that The OpenSearch K8S Operator could be better, we want to hear about it. We track feature requests using GitHub, so please feel free to open an issue which describes the feature you would like to see, why you need it, and how it should work.
+
+### Contributing Code
+
+As with other types of contributions, the first step is to [**open an issue on GitHub**](https://github.com/opensearch-project/OpenSearch/issues/new/choose). Opening an issue before you make changes makes sure that someone else isn't already working on that particular problem. It also lets us all work together to find the right approach before you spend a bunch of time on a PR. So again, when in doubt, open an issue.
+
+## Developer Certificate of Origin
+
+The OpenSearch K8S Operator is an open source product released under the Apache 2.0 license (see either [the Apache site](https://www.apache.org/licenses/LICENSE-2.0) or the [LICENSE.txt file](./LICENSE.txt)). The Apache 2.0 license allows you to freely use, modify, distribute, and sell your own products that include Apache 2.0 licensed software.
+
+We respect intellectual property rights of others and we want to make sure all incoming contributions are correctly attributed and licensed. A Developer Certificate of Origin (DCO) is a lightweight mechanism to do that.
+
+The DCO is a declaration attached to every contribution made by every developer. In the commit message of the contribution, the developer simply adds a `Signed-off-by` statement and thereby agrees to the DCO, which you can find below or at [DeveloperCertificate.org](http://developercertificate.org/).
+
+```
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the
+    best of my knowledge, is covered under an appropriate open
+    source license and I have the right under that license to
+    submit that work with modifications, whether created in whole
+    or in part by me, under the same open source license (unless
+    I am permitted to submit under a different license), as
+    Indicated in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including
+    all personal information I submit with it, including my
+    sign-off) is maintained indefinitely and may be redistributed
+    consistent with this project or the open source license(s)
+    involved.
+ ```
+We require that every contribution to OpenSearch is signed with a Developer Certificate of Origin. Additionally, please use your real name. We do not accept anonymous contributors nor those utilizing pseudonyms.
+
+Each commit must include a DCO which looks like this
+
+```
+Signed-off-by: Jane Smith <[email protected]>
+```
+You may type this line on your own when writing your commit messages. However, if your user.name and user.email are set in your git configs, you can use `-s` or `--signoff` to add the `Signed-off-by` line to the end of the commit message.
+
+## Review Process
+
+We deeply appreciate everyone who takes the time to make a contribution. We will review all contributions as quickly as possible. As a reminder, [opening an issue](https://github.com/Opster/opensearch-k8s-operator) discussing your change before you make it is the best way to smooth the PR process. This will prevent a rejection because someone else is already working on the problem, or because the solution is incompatible with the architectural direction.
+
+During the PR process, expect that there will be some back-and-forth. Please try to respond to comments in a timely fashion, and if you don't wish to continue with the PR, let us know. If a PR takes too many iterations for its complexity or size, we may reject it. Additionally, if you stop responding we may close the PR as abandoned. In either case, if you feel this was done in error, please add a comment on the PR.
+
+If we accept the PR, a [maintainer](MAINTAINERS.md) will merge your change and usually take care of backporting it to appropriate branches ourselves.
+
+If we reject the PR, we will close the pull request with a comment explaining why. This decision isn't always final: if you feel we have misunderstood your intended change or otherwise think that we should reconsider then please continue the conversation with a comment on the PR and we'll do our best to address any further points you raise.

MAINTAINERS.md

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+## Maintainers
+
+| Maintainer | GitHub ID | Affiliation |
+| --------------- | --------- | ----------- |
+| Placeholder | [placeholder](https://github.com/userid) | Company |
+
+
+[This document](https://github.com/Opster/opensearch-k8s-operator/.github/blob/main/MAINTAINERS.md) explains what maintainers do in this repo, and how they should be doing it. If you're interested in contributing, see [CONTRIBUTING](CONTRIBUTING.md).