Update README.md

Author: raj713335

README.md

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 <h1 align="center"><a href="https://www.udemy.com/course/low-level-design-lld-using-python/"> Low Level Design (LLD): Using Python </a></h1>
 
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-  <img src="data/lld.png" />
+  <img src="Data/lld.png" />
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