Update readme

README.md

@@ -1,2 +1,32 @@
 # extract-package-version
+
 Allows you to get the npm version of the package in your Github Actions workflow
+
+## Usage
+
+### Outputs
+
+- `version`: The version of current NPM package
+
+### Example workflow - get NPM version
+
+```yaml
+on: push
+
+name: Create Build
+
+jobs:
+  build:
+    name: Create Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@master
+
+      - name: Extract version
+        id: extract_version
+        uses: Saionaro/extract-package-version@latest
+      # From now you can access version
+      - name: Print version
+        run: echo ${{ steps.extract_version.outputs.version }}
+```