add contributing info

Author: saritai

README.md

@@ -10,6 +10,8 @@ There is [extensive documentation](https://codeql.github.com/docs/) on getting s
 
 We welcome contributions to our standard library and standard checks. Do you have an idea for a new check, or how to improve an existing query? Then please go ahead and open a pull request! Before you do, though, please take the time to read our [contributing guidelines](CONTRIBUTING.md). You can also consult our [style guides](https://github.com/github/codeql/tree/main/docs) to learn how to format your code for consistency and clarity, how to write query metadata, and how to write query help documentation for your query.
 
+For information on contributing to CodeQL documentation, see "[the contributing guide](https://github.com/github/codeql/blob/main/docs/codeql/CONTRIBUTING.md)" for docs.
+
 ## License
 
 The code in this repository is licensed under the [MIT License](LICENSE) by [GitHub](https://github.com).

docs/codeql/CONTRIBUTING.MD

@@ -0,0 +1,9 @@
+# Contributing to CodeQL docs
+
+We welcome contributions to our CodeQL docs. Want to improve existing docs or add new information you think would be helpful? Then please go ahead and open a pull request!
+
+**Note**: We have recently copied the CodeQL CLI documentation on [codeql.github.com](https://codeql.github.com/docs/codeql-cli/) to the public [github/docs](https://github.com/github/docs) repository so that they appear on the [GitHub Docs](https://docs.github.com/en/code-security/code-scanning) site. This includes all articles under "[Using the CodeQL CLI](https://codeql.github.com/docs/codeql-cli/using-the-codeql-cli/)" and "[CodeQL CLI reference](https://codeql.github.com/docs/codeql-cli/codeql-cli-reference/)" categories. To contribute to these docs, which are located in the [`code-security`](https://github.com/github/docs/tree/main/content/code-security/code-scanning) directory, please refer to the [CONTRIBUTING.md](https://github.com/github/docs/blob/main/CONTRIBUTING.md) file in the `docs` repository.
+
+## Contributing to docs on `codeql.github.com`
+
+To make changes to the remaining documentation on [codeql.github.com](https://codeql.github.com/docs/codeql-cli/), you can make changes to the documentation files using the GitHub UI, a codespace, or making changes locally, and then open a pull request for review. For more information about the format and structure of the CodeQL documentation on [codeql.github.com](https://codeql.github.com/docs/codeql-cli/), please see the [README](https://github.com/github/codeql/tree/main/docs/codeql#readme). 

docs/codeql/README.rst

@@ -12,6 +12,8 @@ see https://docutils.sourceforge.io/rst.html.
 
 For more information on Sphinx, see https://www.sphinx-doc.org.
 
+For information on contributing to CodeQL documentation, see "[the contributing guide](/CONTRIBUTING.md)."
+
 Project structure
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