Add documentation portal with MKDocs

docs/README.md

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+# To install:
+pip install mkdocs
+pip install mkdocs-material
+pip install mkdocs-material-extensions
+pip install "mkdocs-material[imaging]"
+
+# docs
+To run localy: `mkdocs serve`
+
+To expand and customize the theme: [Material MKDocs](https://squidfunk.github.io/mkdocs-material/)
+
+The deployment is managed on the gh-pages branches.
+After each merge to main the deplloyment will be taken care of by GH action automatically and the new version will be available at: [Docs](https://codium-ai.github.io/docs/)
+
+Github action is located in `.github/workflows/ci.yml` file.