build: add prettier and eslint (#1090)

.eslintrc.js

@@ -0,0 +1,14 @@
+module.exports = {
+  parser: 'vue-eslint-parser',
+  parserOptions: {
+    parser: 'babel-eslint',
+    sourceType: 'module'
+  },
+  plugins: ['prettier'],
+  extends: [
+    'plugin:prettier/recommended',
+    'plugin:vue/recommended',
+    'prettier/vue'
+  ],
+  ignorePatterns: ['node_modules/', 'dist/', 'coverage/']
+}