chore: add eslint config files

Author: DongWoo Kim

.eslintrc.js

@@ -0,0 +1,20 @@
+module.exports = {
+  parser: 'babel-eslint',
+  parserOptions: {
+    ecmaVersion: 7,
+    sourceType: 'module',
+    ecmaFeatures: {
+      jsx: true
+    }
+  },
+  extends: ['tui/es6', 'plugin:react/recommended', 'plugin:prettier/recommended'],
+  plugins: ['react', 'prettier'],
+  rules: {
+    'react/prop-types': 0
+  },
+  settings: {
+    react: {
+      version: 'detect'
+    }
+  }
+};