Add install.sh to make it easy

Add:

• install.sh to manage first install

Update:

• Fix some documentation texts

Add --upgrade option and more

Update:

• Pattern matching to the --list option
• Some refactor

Add:

• --upgrade option which handle version (see man)
• cheat file

Refactor and Zsh completion

Add:

• Zsh completion
• Multiple args: --default and --keywords can be use at the same time
  Update:
• Refactor to use a loop to parse command args

First Release

\o/ !!!