chore(package): add exports field

Author: nikku

package.json

@@ -5,6 +5,13 @@
   "main": "intersect.js",
   "types": "intersect.d.ts",
   "type": "module",
+  "exports": {
+    ".": {
+      "import": "./intersect.js",
+      "types": "./intersect.d.ts"
+    },
+    "./package.json": "./package.json"
+  },
   "scripts": {
     "all": "run-s lint test",
     "lint": "eslint .",