Added Greeting Actions

.github/workflows/greetings.yml

@@ -0,0 +1,29 @@
+name: Greetings
+
+on:
+  issues:
+    types: [opened]
+  pull_request_target:
+    types: [closed]
+  pull_request:
+    types: [opened]
+
+jobs:
+  greeting:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Greet New Contributors for Creating New PR/Issues.
+        uses: actions/first-interaction@v1
+        if: github.event.action =='opened' && (github.event_name == 'pull_request' || github.event_name == 'issues')
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          issue-message: "@${{ github.actor }} Welcome to Setup-Dotnet🥳 Thanks for opening this Issue 🙌, This Will definitely Improve our Project💖.While we are having a look at this. If you want to work on this then,feel free to self-assign and start working on it.📄  **Use `/assign` to self-assign this issue**."
+          pr-message: "@${{ github.actor }} Thank you for Opening  pull request🥳. We will get back to you as soon as possible. Your patience is greatly appreciated! Thanks! 🥳.  PS: Please double check that you linked the corresponding issue."
+
+      - name: Congratulate on every PR merge
+        if: github.event_name == 'pull_request_target' && github.event.action == 'closed' && github.event.pull_request.merged == true
+        uses: peter-evans/create-or-update-comment@v1
+        with:
+          issue-number: ${{tojson(github.event.number)}}
+          body: |
+            @${{ github.event.pull_request.user.login }} Hurray, your PR got merged 🥳. Thanks a bunch. Feel free to take another Issue.💖