Added readme

README.md

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+To use the service in your ci, add the following Task:
+```yaml
+  deploy:
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: publish
+    steps:
+      - name: Run updater action
+        uses: https://git.leon-hoppe.de/leon.hoppe/ServiceUpdater@main
+        with:
+          service: ${{ inputs.service }}
+```