Add ESLint configuration

.eslintrc.js

@@ -0,0 +1,29 @@
+module.exports = {
+    "env": {
+        "es6": true,
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "rules": {
+        "indent": [
+            "error",
+            2,
+            {
+              "SwitchCase": 1
+            }
+        ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "no-console": 0,
+        "quotes": [
+            "error",
+            "single"
+        ],
+        "semi": [
+            "error",
+            "always"
+        ]
+    }
+};

package.json

@@ -43,5 +43,8 @@
     "term-mouse": "^0.2.0",
     "userhome": "^1.0.0",
     "x256": "0.0.2"
+  },
+  "devDependencies": {
+    "eslint": "^4.13.1"
   }
 }