Added doc for logging in.
Added doc for logging in.

jhass/diaspora,spixi/diaspora,Flaburgan/diaspora,KentShikama/diaspora,diaspora/diaspora,despora/diaspora,diaspora/diaspora,KentShikama/diaspora,Muhannes/diaspora,Muhannes/diaspora,Flaburgan/diaspora,KentShikama/diaspora,jhass/diaspora,geraspora/diaspora,SuperTux88/diaspora,KentShikama/diaspora,jhass/diaspora,Amadren/diaspora,SuperTux88/diaspora,diaspora/diaspora,diaspora/diaspora,spixi/diaspora,Amadren/diaspora,despora/diaspora,Amadren/diaspora,geraspora/diaspora,Muhannes/diaspora,despora/diaspora,SuperTux88/diaspora,despora/diaspora,SuperTux88/diaspora,Flaburgan/diaspora,geraspora/diaspora,Amadren/diaspora,geraspora/diaspora,Muhannes/diaspora,spixi/diaspora,Flaburgan/diaspora,jhass/diaspora,spixi/diaspora