Add linting and prettifying

Author: ehmicky

.eslintrc.json

@@ -0,0 +1,23 @@
+{
+  "plugins": [
+    "node",
+    "prettier"
+  ],
+  "parserOptions": {
+    "sourceType": "module"
+  },
+  "env": {
+    "node": true,
+    "es6": true
+  },
+  "extends": [
+    "plugin:import/errors",
+    "plugin:import/warnings",
+    "eslint:recommended",
+    "plugin:node/recommended",
+    "prettier"
+  ],
+  "rules": {
+    "node/no-unpublished-require": 0
+  }
+}

.gitattributes

@@ -0,0 +1,2 @@
+* text=auto
+*.js text eol=lf

.prettierrc.json

@@ -0,0 +1,5 @@
+{
+  "semi": false,
+  "singleQuote": true,
+  "printWidth": 120
+}