Add lint and coverage tools

Author: axelrindle

.eslintrc.json

@@ -0,0 +1,14 @@
+{
+    "env": {
+        "commonjs": true,
+        "es2020": true,
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+        "ecmaVersion": 11
+    },
+    "rules": {
+        "quotes": [ "warn", "single" ]
+    }
+}