docs: add GitHub templates (#256)

.github/ISSUE_TEMPLATE/---1-report-an-issue.md

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+---
+name: "\U0001F41B Report an issue"
+about: A feature is not working as expected.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### New Issue Checklist
+<!--
+    Check every following box [x] before submitting your issue.
+    Click the "Preview" tab for better readability.
+    Thanks for contributing to Parse Platform!
+-->
+
+- [ ] I am not disclosing a [vulnerability](https://github.com/parse-community/ParseLiveQuery-iOS-OSX/security/policy).
+- [ ] I am not just asking a [question](https://github.com/parse-community/.github/blob/main/SUPPORT.md).
+- [ ] I have searched through [existing issues](https://github.com/parse-community/ParseLiveQuery-iOS-OSX/issues?q=is%3Aissue).
+- [ ] I can reproduce the issue with the latest version of [Parse Server](https://github.com/parse-community/parse-server/releases) and the [Parse LiveQuery ObjC SDK](https://github.com/parse-community/ParseLiveQuery-iOS-OSX/releases). <!-- We don't investigate issues for outdated releases. -->
+
+### Issue Description
+<!-- What is the specific issue? -->
+
+### Steps to reproduce
+<!-- How can someone else reproduce the issue? -->
+
+### Actual Outcome
+<!-- What outcome did you get? -->
+
+### Expected Outcome
+<!-- What outcome did you expect? -->
+
+### Environment
+<!-- Be specific with versions, don't use "latest" or semver ranges like "~x.y.z" or "^x.y.z". -->
+
+Parse LiveQuery ObjC SDK
+- SDK version: `FILL_THIS_OUT`
+- Operating system version: `FILL_THIS_OUT`
+
+Server
+- Parse Server version: `FILL_THIS_OUT`
+- Operating system: `FILL_THIS_OUT`
+- Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): `FILL_THIS_OUT`
+
+Database
+- System (MongoDB or Postgres): `FILL_THIS_OUT`
+- Database version: `FILL_THIS_OUT`
+- Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): `FILL_THIS_OUT`
+
+### Logs
+<!-- Include relevant logs here. Turn on additional logging by configuring VERBOSE=1 in your environment. -->

.github/ISSUE_TEMPLATE/---2-feature-request.md

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+---
+name: "\U0001F4A1 Request a feature"
+about: Suggest new functionality or an enhancement of existing functionality.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### New Feature / Enhancement Checklist
+<!--
+    Check every following box [x] before submitting your issue.
+    Click the "Preview" tab for better readability.
+    Thanks for contributing to Parse Platform!
+-->
+
+- [ ] I am not disclosing a [vulnerability](https://github.com/parse-community/ParseLiveQuery-iOS-OSX/security/policy).
+- [ ] I am not just asking a [question](https://github.com/parse-community/.github/blob/main/SUPPORT.md).
+- [ ] I have searched through [existing issues](https://github.com/parse-community/ParseLiveQuery-iOS-OSX/issues?q=is%3Aissue).
+
+### Current Limitation
+<!-- Which current limitation is the feature or enhancement addressing? -->
+
+### Feature / Enhancement Description
+<!-- What is the concept of the functionality and how should it be implemented? -->
+
+### Example Use Case
+<!-- What is an example use case in steps (1. / 2. / 3. / etc.) that describes the functionality? -->
+
+### Alternatives / Workarounds
+<!-- Which alternatives or workarounds exist currently? -->
+
+### 3rd Party References
+<!-- Have you seen a similar functionality provided somewhere else? -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 🙋🏽‍♀️ Getting help with code
+    url: https://stackoverflow.com/questions/tagged/parse-platform
+    about: Get help with code-level questions on Stack Overflow.
+  - name: 🙋 Getting general help
+    url: https://community.parseplatform.org
+    about: Get help with other questions on our Community Forum.

.github/pull_request_template.md

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+### New Pull Request Checklist
+<!--
+    Please check the following boxes [x] before submitting your issue.
+    Click the "Preview" tab for better readability.
+    Thanks for contributing to Parse Server!
+-->
+
+- [ ] I am not disclosing a [vulnerability](https://github.com/parse-community/ParseLiveQuery-iOS-OSX/blob/master/SECURITY.md).
+- [ ] I am creating this PR in reference to an [issue](https://github.com/parse-community/ParseLiveQuery-iOS-OSX/issues?q=is%3Aissue).
+
+### Issue Description
+<!-- Add a brief description of the issue this PR solves. -->
+
+Related issue: #`FILL_THIS_OUT`
+
+### Approach
+<!-- Add a description of the approach in this PR. -->
+
+### TODOs before merging
+<!--
+    Add TODOs that need to be completed before merging this PR.
+    Delete TODOs that do not apply to this PR.
+-->
+
+- [ ] Add tests
+- [ ] Add changes to documentation (guides, repository pages, in-code descriptions)
+- [ ] Add changelog entry