vijay13@ubuntu:~$ git clone git://anongit.kde.org/plasma-mediacenter
Cloning into 'plasma-mediacenter'...
fatal: read error: Connection reset by peer
Can someone please help me to get rid of above error ?
The problem that you're experiencing is caused by the host, it's down, temporary o permanently.
You can try pinging anongit.kde.org and you'll see that is not responding.
If you don't have any particular reason for using that URL, take a look at this:
http://community.kde.org/Plasma/Plasma_Media_Center
They provide all the information you'd need.
The first stable release of the Plasma Media Center was release 4 months ago and the git for the code is
https://projects.kde.org/projects/extragear/multimedia/plasma-mediacenter/repository