Update README.md

Author: Darshit2790

README.md

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 This is single chat and multi chat user application with the usage of openfire as backend server and using smack library.
 
 Note : one using it has to configure the config.java (com.dcdroid.chatapp.Configuration.config.java) according to their server.
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+Refer User Manual :- https://droidoverflow.blogspot.com/2018/07/create-chat-application-using-openfire.html