Add example in README

Author: its404

README.md

@@ -5,4 +5,26 @@ Get flutter verion number and build number from pubspec.yaml
 ### Outputs
 
 - `version_number`: The flutter version number in pubspect.yaml
-- `builder_number`: The flutter build number in pubspect.yaml
+- `builder_number`: The flutter build number in pubspect.yaml
+
+### Example workflow - get flutter version number and build number
+On every `push` to `master` branch
+
+```yaml
+name: "build"
+on: # rebuild on master branch changes
+  push:
+    branches:
+      - master
+
+jobs:
+  build: # make sure build/ci work properly
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Get flutter version
+        id: get_flutter_version
+        uses: its404/[email protected]
+      - name: Output flutter version
+        run: echo 'version_number:' ${{ steps.get_flutter_version.outputs.version_number }} ' build_number:' ${{ steps.get_flutter_version.outputs.build_number }}
+```