add basic eslint rules

Author: q3e

.eslintrc.js

@@ -0,0 +1,40 @@
+module.exports = {
+  root: true,
+  env: {
+    browser: true,
+    node: true,
+    jest: true
+  },
+  parserOptions: {
+    parser: 'babel-eslint'
+  },
+  extends: [
+    'eslint:recommended',
+    // https://github.com/vuejs/eslint-plugin-vue#priority-a-essential-error-prevention
+    // consider switching to `plugin:vue/strongly-recommended` or `plugin:vue/recommended` for stricter rules.
+    'plugin:vue/recommended',
+    'plugin:prettier/recommended'
+  ],
+  // required to lint *.vue files
+  plugins: [
+    'vue'
+  ],
+  // add your custom rules here
+  rules: {
+    'semi': [2, 'never'],
+    'no-console': 'off',
+    'vue/max-attributes-per-line': 'off',
+    'prettier/prettier': ['error', {
+      'semi': false
+    }],
+    "vue/html-self-closing": ["error", {
+      "html": {
+        "void": "always",
+        "normal": "always",
+        "component": "always"
+      },
+      "svg": "always",
+      "math": "always"
+    }]
+  }
+}