Add linter settings

ui/.eslintrc.js

@@ -0,0 +1,18 @@
+module.exports = {
+    'extends': ['google', 'plugin:react/recommended'],
+    'parser': 'babel-eslint',
+    'env': {
+        'browser': true,
+    },
+    'globals': {
+        'React': true,
+    },
+    'plugins': ['react', 'babel'],
+    'rules': {
+        'linebreak-style': 0,
+        'max-len': ['error', 140],
+        'require-jsdoc': 0,
+        'babel/no-invalid-this': 1,
+        'no-invalid-this': 0,
+    },
+};