ci(Mergify): configuration update (#166)

Signed-off-by: Shambhavi Mishra <nebulatris@gmail.com>

.mergify.yml

@@ -1,8 +1,26 @@
-pull_request_rules:
-  - name: Automatic merge when CI passes and reviews approve
-    conditions:
-      - "#approved-reviews-by>=1"
-      - check-success=CI # replace "CI" with the name of your CI status check
-    actions:
-      merge:
-        method: merge
+pull_request_rules:
+  - name: Automatic merge when CI passes and reviews approve
+    conditions:
+      - "#approved-reviews-by>=1"
+      - check-success=CI # replace "CI" with the name of your CI status check
+    actions:
+      merge:
+        method: merge
+  - name: Ask to resolve conflict
+    conditions:
+      - conflict
+    actions:
+      comment:
+        message: This pull request is now in conflicts. Could you fix this @{{author}} ?
+  - name: comment when a pull request is merged
+    conditions:
+      - merged
+    actions:
+      comment:
+        message: Thank you for your contribution @{{author}}! Your pull request has been merged.
+  - name: comment when a pull request is labeled "needs review"
+    conditions:
+      - label=needs review
+    actions:
+      comment:
+        message: Thank you for your contribution! A reviewer will be assigned soon.