Add crestapps-orchardcore external plugin

Author: MikeAlhayek

plugins/external.json

@@ -138,5 +138,23 @@
       "source": "github",
       "repo": "figma/mcp-server-guide"
     }
+  },
+  {
+    "name": "crestapps-orchardcore",
+    "description": "Orchard Core skills for GitHub Copilot CLI backed by CrestApps.AgentSkills.",
+    "version": "1.0.0",
+    "author": {
+      "name": "CrestApps",
+      "url": "https://github.com/CrestApps"
+    },
+    "homepage": "https://github.com/CrestApps/CrestApps.AgentSkills/tree/main/plugins/crestapps-orchardcore",
+    "keywords": ["orchard-core", "copilot-cli", "skills", "dotnet"],
+    "license": "MIT",
+    "repository": "https://github.com/CrestApps/CrestApps.AgentSkills",
+    "source": {
+      "source": "github",
+      "repo": "CrestApps/CrestApps.AgentSkills",
+      "path": "plugins/crestapps-orchardcore"
+    }
   }
 ]