Add eslintrc in popup

popup/.eslintrc.js

@@ -0,0 +1,44 @@
+module.exports = {
+	"env": {
+		"browser": true,
+		"es6": true
+	},
+	"extends": ["eslint:recommended", "plugin:react/recommended"],
+	"globals": {
+		"Atomics": "readonly",
+		"SharedArrayBuffer": "readonly"
+	},
+	"parserOptions": {
+		"ecmaFeatures": {
+			"jsx": true
+		},
+		"ecmaVersion": 2018,
+		"sourceType": "module"
+	},
+	"plugins": [
+		"react"
+	],
+	"rules": {
+		"indent": [
+			"error",
+			"tab"
+		],
+		"linebreak-style": [
+			"error",
+			"unix"
+		],
+		"quotes": [
+			"error",
+			"double"
+		],
+		"semi": [
+			"error",
+			"always"
+		]
+	},
+	"settings": {
+		"react": {
+			"version": "detect"
+		}
+	}
+};