Update README.md

Author: withinJoel

README.md

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 # LearnJava
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 * The ultimate guide to learn Java.
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+# Star History
+[![Star History Chart](https://api.star-history.com/svg?repos=withinjoel/learnjava&type=Timeline)](https://star-history.com/#withinjoel/learnjava&Timeline)
+
 # Support Me
 If you love LearnJava and want to keep me caffeinated for more awesome updates, consider buying me a coffee!