Add suggest plugin #3189

Author: fourjr

plugins/registry.json

@@ -1 +1,11 @@
-{}
+{
+    "suggest": {
+        "repository": "realcyguy/modmail-plugins",
+        "branch": "v4",
+        "description": "Send suggestions to a selected server! It has accepting, denying, and moderation-ing.",
+        "bot_version": "4.0.0",
+        "title": "Suggest stuff.",
+        "icon_url": "https://i.imgur.com/qtE7AH8.png",
+        "thumbnail_url": "https://i.imgur.com/qtE7AH8.png"
+    }
+}