add deploy addon

.github/workflows/addon-deploy.yml

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+name: "Deploy Anima Addon"
+on: push
+
+jobs:
+  deploy-addon-only:
+    name: Depoly Anima
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Copy addon files
+        run: |
+          mkdir deploy
+          cd deploy
+
+          cp -r ../addons .
+          cp ../LICENSE .
+          cp ../README.ADDON-REPO.md README.md 
+          git init
+          git branch -M main
+          git remote add origin https://github.com/ceceppa/anima-godot-4.git
+          git config user.name "GitHub Actions Bot"
+          git config user.email "<[email protected]>"
+          git add .
+          git commit -m "Update addon files"
+          git remote set-url --push origin https://ceceppa:${{ secrets.TOKEN }}@github.com/ceceppa/anima-godot-4.git
+          git push -f origin main

README.ADDON-REPO.md

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+# Anima pluging for Godot 4
+
+This is the ready-to-be-installed [Anima](https://github.com/ceceppa/anima) addon for Godot4.
+
+## NOTE
+
+**The plugin is still in development and not all the feature works fine on Godot4.**
+
+This repository contains only the **addon** code without the demo and documentation and has been created to allow users to install the addon via the AssetLibrary.
+
+The development happens on the [godot-4](https://github.com/ceceppa/anima/tree/godot-4) branch of the main [anima repository](https://github.com/ceceppa/anima/). So, any issue or pull request needs to be open there.
+
+## Documentation
+
+WIP documentation is available [here](https://anima.ceceppa.me/docs/)