add eslint and prettier

Author: simonrousseau

.eslintrc.js

@@ -0,0 +1,19 @@
+module.exports = {
+    env: {
+        browser: true,
+        es6: true,
+    },
+    extends: ['eslint:recommended', 'plugin:vue/essential'],
+    globals: {
+        Atomics: 'readonly',
+        SharedArrayBuffer: 'readonly',
+    },
+    parserOptions: {
+        ecmaVersion: 2018,
+        sourceType: 'module',
+    },
+    plugins: ['vue'],
+    rules: {
+        semi: ['error', 'always'],
+    },
+};

.prettierignore

@@ -0,0 +1,3 @@
+# Ignore artifacts:
+build
+coverage

.prettierrc.json

@@ -0,0 +1,6 @@
+{
+    "trailingComma": "es5",
+    "tabWidth": 4,
+    "semi": true,
+    "singleQuote": true
+}