Plugins: add Python Discord's

- **Case insensitive snippets**: Allow snippets to be ran even if with the wrong case. For example, `?Dm-RePort` will be recognized as `?dm-report`.
- **Close message:** Add a `?closemessage` command that will close the thread after 15 minutes with a default message.
- **MDLink**: Generate a ready to paste link to the thread logs.
- **Reply cooldown**: Forbid you from sending the same message twice in ten seconds.
- **Tagging**: Add a `?tag` command capable of adding a `$message｜` header to the channel name.

Author: Akarys42

plugins/registry.json

@@ -1,4 +1,49 @@
 {
+    "case_insensitive_snippets": {
+        "repository": "python-discord/modmail-plugins",
+        "branch": "main",
+        "description": "Allow snippets to be ran even if with the wrong case. For example, ?Dm-RePort will be recognized as ?dm-report.",
+        "bot_version": "2.20.1",
+        "title": "Case insensitive snippets",
+        "icon_url": "https://i.imgur.com/kaJYlMB.png",
+        "thumbnail_url": "https://i.imgur.com/kaJYlMB.png"
+    },
+    "close_message": {
+        "repository": "python-discord/modmail-plugins",
+        "branch": "main",
+        "description": "Add a ?closemessage command that will close the thread after 15 minutes with a default message.",
+        "bot_version": "2.20.1",
+        "title": "Close message",
+        "icon_url": "https://i.imgur.com/ev7BFMz.png",
+        "thumbnail_url": "https://i.imgur.com/ev7BFMz.png"
+    },
+    "mdlink": {
+        "repository": "python-discord/modmail-plugins",
+        "branch": "main",
+        "description": "Generate a ready to paste link to the thread logs.",
+        "bot_version": "2.20.1",
+        "title": "MDLink",
+        "icon_url": "https://i.imgur.com/JA2E63R.png",
+        "thumbnail_url": "https://i.imgur.com/JA2E63R.png"
+    },
+    "reply_cooldown": {
+        "repository": "python-discord/modmail-plugins",
+        "branch": "main",
+        "description": "Forbid you from sending the same message twice in ten seconds.",
+        "bot_version": "2.20.1",
+        "title": "Reply cooldown",
+        "icon_url": "https://i.imgur.com/FtRQveT.png",
+        "thumbnail_url": "https://i.imgur.com/FtRQveT.png"
+    },
+    "tagging": {
+        "repository": "python-discord/modmail-plugins",
+        "branch": "main",
+        "description": "Add a ?tag command capable of adding a $message｜ header to the channel name.",
+        "bot_version": "2.20.1",
+        "title": "Tagging",
+        "icon_url": "https://i.imgur.com/WajSLB1.png",
+        "thumbnail_url": "https://i.imgur.com/WajSLB1.png"
+    },
     "dragory-migrate": {
         "repository": "kyb3r/modmail-plugins",
         "branch": "master",