chore: set files field for package.json

Author: talkhabi

package.json

@@ -22,6 +22,11 @@
     "type": "git",
     "url": "https://github.com/talkhabi/vue-persian-datetime-picker"
   },
+  "files": [
+    "src",
+    "dist/*.js",
+    "index.d.ts"
+  ],
   "scripts": {
     "serve": "vuepress dev docs",
     "build": "npm run export-common & npm run export-umd",