Merge pull request #2 from Khan/jaredly-patch-1

Update Readme.md

Author: jaredly

Readme.md

@@ -3,3 +3,31 @@
 Look for a "trigger word" in a pull-request description or comment, so that later actions can know whether or not to run.
 
 This is most useful in tandem with [workflow-preprocessor], so that you don't have to be writing a ton of `if`s all down the line.
+
+## Example usage in workflow
+
+Your workflow needs to listen to the following events:
+```
+on:
+  pull_request:
+    types: [opened]
+  issue_comment:
+    types: [created]
+```
+
+And then you can use the action in your jobs like this:
+
+```
+jobs:
+  do_some_work:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: khan/pull-request-comment-trigger@master
+        id: check
+        with:
+          trigger: '@hello/world'
+        env:
+          GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
+      - run: 'echo Found it!'
+        if: steps.check.outputs.triggered == 'true'
+```