add logo to README.md

Author: tasansal

README.md

@@ -1,4 +1,7 @@
-# MDIO
+<div>
+  <img src="https://raw.githubusercontent.com/TGSAI/mdio.github.io/gh-pages/assets/images/mdio.png",
+width=200"><br>
+</div>
 
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