Use option -u for git push in git instruction settings

Hello,

I suggest to use -u option for git push command for initially push to repository. Like this:

git push -u origin master

instead of

git push origin master

The -u option do the follows:
For every branch that is up to date or successfully pushed, add upstream (tracking) reference, used by argument-less git-pull(1) and other commands.

So, after pushing my local branch with -u option, this local branch will be automatically linked with remote branch, and I can use git pull without arguments - this is more usefull.