[Pidgin] #10605: libpurple chat API documentation

[Pidgin]

#10605: libpurple chat API documentation
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Reporter:  StTwister  |        Type:  patch             
  Status:  new        |   Component:  libpurple         
 Version:  2.6.3      |    Keywords:  chat documentation
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 I've documented the chat API in libpurple. Hopefully new developers will
 now find it easier to understand how the chat system works. I'm sure it
 would have helped me a lot :)

 So, if someone can kindly review this, I or the reviewer could push this
 to mtn.

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Ticket URL: <http://developer.pidgin.im/ticket/10605>
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