add eslint/prettier configs

.eslintignore

@@ -0,0 +1 @@
+node_modules

.eslintrc.js

@@ -0,0 +1,20 @@
+module.exports = {
+    extends: ['airbnb-base', 'prettier'],
+    plugins: ['prettier'],
+    globals: {
+        'artifacts': false,
+        'contract': false,
+        'assert': false,
+        'web3': false,
+        'before': false,
+        'beforeEach': false,
+        'it': false,
+    },
+    rules: {
+      'prettier/prettier': ['error'],
+      'func-names': 0,
+      'no-underscore-dangle': 0,
+      'no-use-before-define': 0,
+      'prefer-destructuring': 0
+    },
+}; 

.prettierrc

@@ -0,0 +1,9 @@
+{
+  'printWidth': 100,
+  'singleQuote': true,
+  'semi': false,
+  'useTabs': true,
+  'tabWidth': 2,
+  'prefer-destructuring': false,
+  'consistent-return': false,
+}