Add external plugin ui5-typescript-conversion (#1959)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: aaronpowell <434140+aaronpowell@users.noreply.github.com>

.github/plugin/marketplace.json

@@ -907,6 +907,35 @@
         "sha": "9b3d7d80356f687725f9584988e4038dbead0d53"
       }
     },
+    {
+      "name": "ui5-typescript-conversion",
+      "description": "SAPUI5 / OpenUI5 plugin for GitHub CoPilot. Convert JavaScript based UI5 projects to TypeScript.",
+      "version": "0.1.3",
+      "author": {
+        "name": "SAP SE",
+        "url": "https://www.sap.com"
+      },
+      "repository": "https://github.com/UI5/plugins-coding-agents",
+      "homepage": "https://github.com/UI5/plugins-coding-agents",
+      "license": "Apache-2.0",
+      "keywords": [
+        "ui5",
+        "sapui5",
+        "openui5",
+        "typescript",
+        "conversion",
+        "migration",
+        "sap",
+        "javascript"
+      ],
+      "source": {
+        "source": "github",
+        "repo": "UI5/plugins-coding-agents",
+        "path": "plugins/ui5-typescript-conversion",
+        "ref": "v0.1.3",
+        "sha": "9b3d7d80356f687725f9584988e4038dbead0d53"
+      }
+    },
     {
       "name": "vercel-plugin",
       "description": "Build and deploy web apps and agents. Comprehensive Vercel ecosystem plugin — relational knowledge graph, skills for every major product, specialized agents, and Vercel conventions. Turns any AI agent into a Vercel expert.",