Add microbundle and configuration to package

package.json

@@ -6,5 +6,18 @@
   "repository": "/~https://github.com/addyosmani/quicklink.git",
   "author": "addyosmani <addyosmani@gmail.com>",
   "license": "Apache-2.0",
-  "private": false
+  "private": false,
+  "main": "dist/quicklink.js",
+  "module": "dist/quicklink.mjs",
+  "jsnext:main": "dist/quicklink.mjs",
+  "umd:main": "dist/quicklink.umd.js",
+  "scripts": {
+    "test": "eslint src",
+    "build": "microbundle src/index.mjs --no-sourcemap",
+    "prepare": "npm run -s build"
+  },
+  "devDependencies": {
+    "eslint": "^5.9.0",
+    "microbundle": "^0.7.0"
+  }
 }

src/.editorconfig

@@ -0,0 +1,17 @@
+root = true
+
+[*]
+indent_style = tab
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{package.json,.*rc,*.yml}]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+indent_style = space
+indent_size = 2