ci: add workflow to auto-update README on release (#11)

Author: mmonterroca

.github/workflows/update-readme-on-release.yml

@@ -0,0 +1,45 @@
+name: Update README on Release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  update-readme:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: master
+      
+      - name: Get release info
+        id: release
+        run: |
+          echo "version=${{ github.event.release.tag_name }}" >> $GITHUB_OUTPUT
+          echo "date=$(date +'%B %Y')" >> $GITHUB_OUTPUT
+      
+      - name: Update README version
+        run: |
+          # Update version line
+          sed -i "s/\*\*Current Version\*\*: v[0-9]*\.[0-9]*\.[0-9]*/\*\*Current Version\*\*: ${{ steps.release.outputs.version }}/" README.md
+          
+          # Update release date
+          sed -i "s/\*\*Released\*\*: [A-Za-z]* [0-9]*/\*\*Released\*\*: ${{ steps.release.outputs.date }}/" README.md
+      
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v5
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: "docs: update README version to ${{ steps.release.outputs.version }}"
+          title: "docs: update README version to ${{ steps.release.outputs.version }}"
+          body: |
+            Automatically update README.md version info after release.
+            
+            - Version: ${{ steps.release.outputs.version }}
+            - Date: ${{ steps.release.outputs.date }}
+          branch: auto/update-readme-${{ steps.release.outputs.version }}
+          base: master