Step 1: Download and Move These Files To Home Directory

git-completion.bash

git-prompt.sh

mv git-completion.bash ~
mv git-prompt.sh ~

Step 2: Add Code To Your ~/.bash_profile

# Enable tab completion
source ~/git-completion.bash

# Change command prompt
source ~/git-prompt.sh

# colors!
red="\\[\\033[38;5;203m\\]"
green="\\[\\033[38;05;38m\\]"
blue="\\[\\033[0;34m\\]"
reset="\\[\\033[0m\\]"

export GIT_PS1_SHOWDIRTYSTATE=1

# '\\u' adds the name of the current user to the prompt
# '\\$(__git_ps1)' adds git-related stuff
# '\\W' adds the name of the current directory
export PS1="$red\\u$green\\$(__git_ps1)$blue \\W
$ $reset"

Step 3: Restart Terminal