todo.txt: CLI ToDo utility

Installed todo.txt using Homebrew and copied the config file to the home directory.

Customized config file. TODODIR is ~/todo.

Created a symbolic link from /usr/loca/bin/todo.sh to ~/todo.sh

For usage, type > t help

Aliases

# todo.txt aliases
alias t="todo.sh"
alias ta="todo.sh add"
alias td="todo.sh do"
alias tls="todo.sh ls"