Add first interaction action

This action greets new contributors that open issues/PRs

.github/workflows/first-interaction.yml

@@ -0,0 +1,27 @@
+name: Welcome New Contributor
+
+on:
+  issues:
+    types: [opened]
+  pull_request_target:
+    types: [opened]
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/first-interaction@v1.1.1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          issue-message: |
+            Hello & Welcome! :)
+            
+            Thanks for taking the time to get in touch. We'll review this issue shortly.
+            
+            Whilst you're waiting, please feel free to check out the [forum](https://forum.itflow.org).
+          pr-message: |
+            Hello & Welcome! :)
+            
+            Thanks for taking the time to help improve ITFlow. We're excited to review your contributions - we'll review this PR as soon as we can!
+            
+            Whilst you're waiting, please feel free to check out the [forum](https://forum.itflow.org).