Update README.md

Author: jonacappelle

README.md

@@ -2,8 +2,4 @@
 
 Supplementary material for "MDPI Electronics special issue Wireless Power Transfer Systems: Design and Implementation"
 
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-        <p>This browser does not support PDFs. Please download the PDF to view it: <a href="https://github.com/DRAMCO/Contactless-Battery-Solution-for-Sustainable-IoT-Devices/blob/main/Assets/overview.pdf">Download PDF</a>.</p>
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+![overview](https://github.com/DRAMCO/Contactless-Battery-Solution-for-Sustainable-IoT-Devices/blob/main/Assets/overview.jpg)