[ADD] Bltzz solution incl. Unit tests and style checks

.eslintrc.js

@@ -0,0 +1,21 @@
+module.exports = {
+    "extends": "airbnb-base",
+    "env": {
+      "node":true,
+      "mocha": true,
+      "es6": true,
+    },
+    "globals": {
+      "expect": true,
+      "sinon": true,
+    },
+    "plugins": [
+      "import"
+    ],
+    "rules": {
+      "no-underscore-dangle": 0,
+    },
+    "parserOptions": {
+      "ecmaVersion": 13,
+    },
+  };