Added linting.

.eslintrc

@@ -3,7 +3,8 @@
     "extends": "airbnb-base",
     "parser": "@babel/eslint-parser",
     "parserOptions": {
-        "sourceType": "script"
+        "sourceType": "script",
+	"requireConfigFile": false
     },
     "env": {
         "es2020": true
@@ -12,7 +13,8 @@
         "strict": 0,
         "no-unused-vars": ["error", {"argsIgnorePattern": "^_"}],
         "no-console": 0,
-        "indent": ["error", 4],
+        "indent": ["error", "tab"],
+		"no-tabs": 0,
         "max-len": [2, {"code": 400, "tabWidth": 4, "ignoreUrls": true}]
     }
 }