Add more info to the package.json and add a lock file.

Author: feanil

frontend/package-lock.json

@@ -1,4 +1,8 @@
 {
   "name": "@feanil/sample-plugin",
-  "version": "0.0.1"
+  "version": "0.0.1",
+  "main": "src/index.jsx",
+  "peerDependencies": {
+    "react": "*"
+  }
 }