refactor: add files field in package.json

Author: cossssmin

.npmignore

@@ -7,6 +7,9 @@
   "author": "Damir Grgic <damir@tuta.io> (https://github.com/thewebartisan7)",
   "main": "src",
   "types": "src/index.d.ts",
+  "files": [
+    "src"
+  ],
   "engines": {
     "node": ">=18"
   },