Litecoin installation Whonix

I know this is not only for whonix, but can anybody tell me how to install litecoin wallet?
I google about this, but I need it step by step, because im new in debian and linux.

A good link is also fine.

Package litecoin (litecoin-qt) is in the unstable distro of Debian

Search for “how to get packages from unstable to Wheezy”.