chore: Update README with new problem

README.md

@@ -3,7 +3,7 @@
 ![repo stars](https://img.shields.io/github/stars/saulmaldonado/ds-and-algorithms?style=social)
 ![github followers](https://img.shields.io/github/followers/saulmaldonado?style=social)
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-![number of problems](https://img.shields.io/badge/no.%20of%20problems-159-blue)
+![number of problems](https://img.shields.io/badge/no.%20of%20problems-160-blue)
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 > Data structures and algorithm problems with solution explanations and implementations for different languages
@@ -232,6 +232,10 @@
   <a href="strings/check-if-two-string-arrays-are-equivalent">
     Check If Two String Arrays Are Equivalent
   </a> - Easy
+</li><li>
+  <a href="strings/vowel-spellchecker">
+    Vowel Spellchecker
+  </a> - Medium
 </li><li>
   <a href="strings/check-if-a-string-contains-all-binary-codes-of-size-k">
     Check If A String Contains All Binary Codes Of Size K