Create CONTRIBUTORS.md

Author: Tahanima

CONTRIBUTORS.md

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+## Contributors ✨
+
+<table>
+  <tr>
+    <td align="center"><a href="https://github.com/Tahanima"><img src="https://avatars.githubusercontent.com/u/6233068?v=4" width="100px;" alt=""/><br /><sub><b>Tahanima Chowdhury</b></sub></a><br /><a href="https://github.com/Tahanima/leetcode-solution-curation/commits?author=Tahanima" title="Contribution">📖</a></td>
+    <td align="center"><a href="https://github.com/nakhlarafi"><img src="https://avatars.githubusercontent.com/u/33758354?v=4" width="100px;" alt=""/><br /><sub><b>Nakhla Rafi</b></sub></a><br /><a href="https://github.com/Tahanima/leetcode-solution-curation/commits?author=nakhlarafi" title="Contribution">📖</a></td>
+  </tr>
+</table>