feat : levenshtein 설치 및 test

@@ -14,6 +14,7 @@
     "hangul-js": "^0.2.6",
     "http-errors": "~1.6.3",
     "jade": "~1.11.0",
+    "js-levenshtein": "^1.1.6",
     "morgan": "~1.9.1",
     "mysql2": "^2.2.5"
   },

+const levenshtein = require('js-levenshtein');
+
+const calcDistance = () => {
+  const result = levenshtein('개새끼', 'ㄱHsㅐㄲ!');
+  console.log(result);
+};
+
+calcDistance();