[Suggestion] Add Package Management Command - dpkg -i

[shindesharad71]

Hello @Idnan
Thanks for making such awesome bash guide, i really liked it.

Please add .deb package installation command dpkg -i to install the .deb packages by command line.

Thanks.

[mumararshaikh]

How to do the same for rpm package is also needfull.
@shindesharad71 why not open new pull request.

[shindesharad71]

Ok @mumararshaikh , I will add commands for both.

[shindesharad71]

I created a pull request. take review here #46