get git to change renamed files code example

Example: how to Rename or Move files in GIT

# Short answer:
git mv filename new_filename
or
git mv /path/to/file_location /path/to/new/file_location

# Note, if you manually move a file or rename it (w/o git mv) git may
# 	treat the moved/renamed file as a new file 
# Note, it's fairly popular to use the alias gm for git mv