docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -217,6 +217,7 @@ If you can help us with these. Please don't hesitate to open an [pull request](h
     <td align="center"><a href="https://prabin-karki.com.np"><img src="https://avatars.githubusercontent.com/u/43983896?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Prabin Karki</b></sub></a><br /><a href="https://github.com/ashutosh1919/masterPortfolio/commits?author=githubprabin143" title="Code">💻</a></td>
     <td align="center"><a href="https://praveen.science/"><img src="https://avatars.githubusercontent.com/u/1830380?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Praveen Kumar Purushothaman</b></sub></a><br /><a href="https://github.com/ashutosh1919/masterPortfolio/commits?author=praveenscience" title="Documentation">📖</a></td>
     <td align="center"><a href="http://baul.ml"><img src="https://avatars.githubusercontent.com/u/33395806?v=4?s=100" width="100px;" alt=""/><br /><sub><b>paul</b></sub></a><br /><a href="https://github.com/ashutosh1919/masterPortfolio/commits?author=baulml" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/SandipDhang"><img src="https://avatars.githubusercontent.com/u/50694884?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Sandip Dhang</b></sub></a><br /><a href="https://github.com/ashutosh1919/masterPortfolio/commits?author=SandipDhang" title="Code">💻</a></td>
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