Add eslintrc

.eslintrc

+{
+  "env": {
+    "node": true,
+    "mocha": true,
+    "es6": true
+  },
+  "extends": [
+    "eslint:recommended"
+  ],
+  "parserOptions": {
+    "sourceType": "module"
+  },
+  "rules": {
+    "quotemark": false,
+    "ordered-imports": false,
+    "no-var-requires": false,
+    "indent": [
+      "error",
+      2
+    ],
+    "no-console": 0,
+    "eofline": false,
+    "no-unused-variable": true,
+    "no-unused-expression": true,
+    "only-arrow-functions": false,
+    "space-before-function-paren": 0,
+    "trailing-comma": [
+      true,
+      "never"
+    ],
+    "object-literal-sort-keys": false,
+    "semi": [
+      "warn",
+      "never"
+    ],
+    "space-infix-ops": [
+      "warn"
+    ],
+    "no-var": "error",
+    "prefer-const": "error",
+    "no-trailing-spaces": "error"
+  }
+}
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