iptables does not list rules i have created

The command iptables -nvL is displaying the contents of the filter table. The rule you are adding is in the nat table. Add -t nat to look at the nat table:

iptables -t nat -nvL

You can also run iptables-save and it'll dump all the contents to the screen if you just want to look at everything. I find it easy to look at everything that way when I feel lazy.