Add the section "Changing the History"

Add some examples to work with and to change the repositorie's history.
Add the section "Branching"

Add some examples how to work with branches.
Add the section "Tagging"

Add some examples how to work with tags.
Add the section "Remote Repositories"

Add some examples how to work with remote repsitories.
Add the section "Patches"

Add some examples how to work with patches.