DOC: adjust the example to show a full yaml file

README.md

@@ -7,12 +7,20 @@ An action for filtering pull requests and issues from first-time contributors.
 See [action.yml](action.yml)
 
 ```yaml
-steps:
+name: Greetings
-- uses: actions/first-interaction@v1
+
-  with:
+on: [pull_request, issues]
-    repo-token: ${{ secrets.GITHUB_TOKEN }}
+
-    issue-message: '# Message with markdown.\nThis is the message that will be displayed on users' first issue.'
+jobs:
-    pr-message: 'Message that will be displayed on users' first pr. Look, a `code block` for markdown.'
+  greeting:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/first-interaction@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        issue-message: 'Message that will be displayed on users'' first issue'
+        pr-message: 'Message that will be displayed on users'' first pr'
+
 ```
 
 # License