Added github workflow

Author: JulianFun123

package.json

@@ -2,7 +2,7 @@
   "name": "mapm",
   "version": "1.0.0",
   "description": "A package manager for import maps",
-  "main": "index.js",
+  "main": "src/index.js",
   "type": "module",
   "bin": {
     "mapm": "./dist/mapm.js"