[CONTRIBUTING] Add CONTRIBUTING file

Add CONTRIBUTING file with information about CLA and Google's code of
conduct to follow Google conventions/policies and make contributing
easier. Move the information of the _Contributing_ section of the README
to this document.

CONTRIBUTING.md

@@ -0,0 +1,33 @@
+# How to contribute
+
+Want to open an issue or send a code contribution?
+Read the information below to learn how.
+We are looking forward working with you to improve FLARE-VM! :sparkling_heart:
+
+## Repository structure of FLARE-VM
+
+The FLARE-VM code is spited in two repositories:
+- **[FLARE-VM](https://github.com/mandiant/flare-vm) (this repository)**: FLARE-VM installation script, and configuration
+  - [Submit improvement proposals and report issues related to the installer](https://github.com/mandiant/flare-vm/issues/new/choose)
+
+- **[VM-Packages](https://github.com/mandiant/VM-Packages)**: Source code of tool packages used by FLARE-VM (this repository) and [CommandoVM](https://github.com/mandiant/commando-vm)
+  - [Documentation and contribution guides for tool packages](https://github.com/mandiant/VM-Packages/wiki)
+  - [Submit new tool packages or report package related issues](https://github.com/mandiant/VM-Packages/issues/new/choose)
+
+Before opening an issue, ensure you select the correct repository ([FLARE-VM](https://github.com/mandiant/flare-vm) for the FLARE-VM installer, [VM-Packages](https://github.com/mandiant/VM-Packages) for concrete tools and packages).
+Select the correct issue type and read the issue template carefully to ensure you provide all needed information.
+
+## Before contributing code
+
+### Sign our Contributor License Agreement
+
+Contributions to this project must be accompanied by a [Contributor License Agreement](https://cla.developers.google.com/about) (CLA).
+You (or your employer) retain the copyright to your contribution; this simply gives us permission to use and redistribute your contributions as part of the project.
+
+If you or your current employer have already signed the Google CLA (even if it was for a different project), you probably don't need to do it again.
+
+Visit <https://cla.developers.google.com/> to see your current agreements or to sign a new one.
+
+## Review our community guidelines
+
+This project follows [Google's Open Source Community Guidelines](https://opensource.google/conduct/).

README.md

@@ -107,7 +107,7 @@ The installer will use [CustomStartLayout.xml](https://raw.githubusercontent.com
 
 ##### Things to Consider:
 - Items in the .xml that are not installed will not display in the taskbar (no broken links will be pinned)
-- Only applications (.exe files) or shortcuts to applications can be pinned.
+- Only applications (`.exe` files) or shortcuts to applications can be pinned.
 - If you would like to pin something that isn't an application, consider creating a shortcut that points to `cmd.exe` or `powershell` with arguments supplied that will perform that actions you would like.
 - If you would like to make something run with admin rights, consider making a shortcut using `VM-Install-Shortcut` with the flag `-runAsAdmin` and pinning the shortcut.
 
@@ -125,18 +125,10 @@ For example:
 
 For more examples, check the default configuration file: [config.xml](https://raw.githubusercontent.com/mandiant/flare-vm/main/config.xml).
 
-## Contributing
-
-Want to get started contributing? See the links below to learn how. We are looking forward working with you to improve FLARE-VM! :sparkling_heart:
 
-### FLARE-VM (this repository)
-* FLARE-VM installation script, and configuration: https://github.com/mandiant/flare-vm
-  * [Submit improvement proposals and report issues related to the installer](https://github.com/mandiant/flare-vm/issues/new/choose)
+## Contributing
 
-### VM-Packages
-* Repository of all tool packages: https://github.com/mandiant/VM-Packages
-  * [Documentation and contribution guides for tool packages](https://github.com/mandiant/VM-Packages/wiki)
-  * [Submit new tool packages or report package related issues](https://github.com/mandiant/VM-Packages/issues/new/choose)
+- Check our [CONTRIBUTING guide](/CONTRIBUTING.md) to learn how to contribute to the project.
 
 ## Troubleshooting
 If your installation fails, please attempt to identify the reason for the installation error by reading through the log files listed below on your system: