Add documentation portal with MKDocs

docs/docs/tools/documentation.md

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+## Overview
+The `add_docs` tool scans the PR code changes, and automatically suggests documentation for any code components that changed in the PR (functions, classes, etc.).
+
+It can be invoked manually by commenting on any PR:
+```
+/add_docs
+```
+For example:
+
+<kbd><img src=https://codium.ai/images/pr_agent/docs_command.png width="768"></kbd>
+
+<kbd><img src=https://codium.ai/images/pr_agent/docs_components.png width="768"></kbd>
+
+<kbd><img src=https://codium.ai/images/pr_agent/docs_single_component.png width="768"></kbd>
+
+## Configuration options
+ - `docs_style`: The exact style of the documentation (for python docstring). you can choose between: `google`, `numpy`, `sphinx`, `restructuredtext`, `plain`. Default is `sphinx`.
+ - `extra_instructions`: Optional extra instructions to the tool. For example: "focus on the changes in the file X. Ignore change in ...".
+
+**Notes**
+
+- Language that are currently fully supported: Python, Java, C++, JavaScript, TypeScript.
+- For languages that are not fully supported, the tool will suggest documentation only for new components in the PR.
+- A previous version of the tool, that offered support only for new components, was deprecated.