Add exports to package.json

Author: pksjce

package.json

@@ -4,6 +4,11 @@
   "description": "An implementation of GitHub's Primer Design System using React",
   "main": "lib/index.js",
   "module": "lib-esm/index.js",
+  "exports":{
+    ".": "./lib-esm/index.js",
+    "./drafts": "./lib-esm/drafts.js",
+    "./lib-esm/drafts": "./lib-esm/drafts.js"
+  },
   "typings": "lib/index.d.ts",
   "sideEffects": false,
   "scripts": {