Add microsoft-events plugin (Microsoft Build & Ignite sessions) (#1681)

* Add microsoft-events plugin (Microsoft Build & Ignite sessions)

Adds the Microsoft Events skill to the external plugins registry.
This skill connects developer projects to Microsoft Build and Ignite
session catalogs, enabling session discovery, tech stack updates,
and schedule planning from Copilot CLI and VS Code.

Repository: https://github.com/microsoft/Build-CLI

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* updating marketplace

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Aaron Powell <me@aaron-powell.com>

.github/plugin/marketplace.json

@@ -368,6 +368,30 @@
         "repo": "MicrosoftDocs/mcp"
       }
     },
+    {
+      "name": "microsoft-events",
+      "description": "Connect your project to Microsoft Build and Ignite sessions — discover relevant talks, explore what's new for your stack, and plan next steps from your development environment.",
+      "version": "1.0.0",
+      "author": {
+        "name": "Microsoft",
+        "url": "https://www.microsoft.com"
+      },
+      "homepage": "https://github.com/microsoft/Build-CLI",
+      "keywords": [
+        "microsoft",
+        "build",
+        "ignite",
+        "events",
+        "sessions",
+        "learn"
+      ],
+      "license": "Apache-2.0",
+      "repository": "https://github.com/microsoft/Build-CLI",
+      "source": {
+        "source": "github",
+        "repo": "microsoft/Build-CLI"
+      }
+    },
     {
       "name": "modernize-dotnet",
       "description": "AI-powered .NET modernization and upgrade assistant. Helps upgrade .NET Framework and .NET applications to the latest versions of .NET.",