fix: add skypack recommended fields (#1791)

Author: balazsorban44

package.json

@@ -6,6 +6,16 @@
   "repository": "https://github.com/nextauthjs/next-auth.git",
   "author": "Iain Collins <[email protected]>",
   "main": "index.js",
+  "types": "./index.d.ts",
+  "keywords": ["react", "nodejs", "oauth", "jwt", "oauth2", "authentication", "nextjs", "csrf", "oidc", "nextauth"],
+  "exports": {
+    ".": "./dist/server/index.js",
+    "./jwt": "./dist/lib/jwt.js",
+    "./adapters": "./dist/adapters/index.js",
+    "./client": "./dist/client/index.js",
+    "./providers": "./dist/providers/index.js",
+    "./providers/*": "./dist/providers/*.js"
+  },
   "scripts": {
     "build": "npm run build:js && npm run build:css",
     "build:js": "node ./config/build.js && babel --config-file ./config/babel.config.json src --out-dir dist",