Add eslint

.eslintrc.js

@@ -0,0 +1,37 @@
+module.exports = {
+  "parser": "babel-eslint",
+  "env": {
+    "browser": true,
+    "es6": true
+  },
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "ecmaFeatures": {
+      "experimentalObjectRestSpread": true,
+      "jsx": true
+    },
+    "sourceType": "module"
+  },
+  "plugins": [
+    "react", "flowtype"
+  ],
+  "rules": {
+    "indent": ["error", 2],
+    "linebreak-style": ["error", "unix"],
+    "quotes": ["error","double"],
+    "semi": ["error","always"],
+    "no-unused-vars": ["error", { "varsIgnorePattern": "^_", "argsIgnorePattern": "^_" }],
+
+    "react/jsx-uses-react": 2,
+    "react/jsx-uses-vars": 2,
+    "react/react-in-jsx-scope": "error",
+
+    "flowtype/define-flow-type": 2,
+    "flowtype/boolean-style": "error",
+    "flowtype/generic-spacing": ["error", "never"],
+    "flowtype/no-dupe-keys": "error",
+    "flowtype/union-intersection-spacing": ["error", "always"],
+    "flowtype/no-weak-types": "warn",
+    "flowtype/require-variable-type": "warn"
+  }
+};