fix: Add skills prop in plugin.json

Author: d3xter666

plugins/ui5-typescript-conversion/plugin.json

@@ -16,5 +16,8 @@
         "plugin",
         "typescript",
         "conversion"
+    ],
+    "skills": [
+        "./skills/"
     ]
 }

plugins/ui5/plugin.json

@@ -18,5 +18,9 @@
         "api documentation",
         "development guidelines",
         "best practices"
+    ],
+    "skills": [
+        "./skills/ui5-best-practices",
+        "./skills/ui5-best-practices-integration-cards"
     ]
 }