add lint command

Author: nklayman

package.json

@@ -4,7 +4,8 @@
   "description": "A Vue Cli 3 plugin for Electron with no required configuration",
   "main": "index.js",
   "scripts": {
-    "test": "jest --runInBand"
+    "test": "jest --runInBand",
+    "lint": "eslint --ignore-pattern projects ./"
   },
   "keywords": [
     "electron",