Update README.md

Author: extinctsion

README.md

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    *Note: To complete the Hacktoberfest challenge, you need to open four valid pull requests. If you've followed the above steps, you've already opened one pull request, and you need three more.*
 </details>
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+<div align="center">
+![Library File structure](easypythonpi_diagram.png)
+</div>
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     <h2>Running Test Cases</h2>
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