Update README.md

Learn2Crack · Aug 8, 2017 · 7d0ea63 · 7d0ea63
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 ## Changing Server URL
 
 Modify the __URL__ variable in MainActivity.java. The server URL will be __10.0.2.2__ if you are testing in emulator, else use the server IP.
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+## Tutorial
+https://www.learn2crack.com/2017/08/upload-image-using-retrofit.html