Document `~/.zqs-settings/testbranch`
Document `~/.zqs-settings/testbranch`

Document using `~/.zqs-settings/testbranch` during testing.

Signed-off-by: Joe Block <13bb081c6ac072ef78a3e348068e2204400d7335@unixorn.net>

unixorn/zsh-quickstart-kit