Add norm theme

themes/norm.zsh-theme

+PROMPT='%{$fg[yellow]%}λ %{$fg[green]%}${PWD/#$HOME/~} %{$fg[yellow]%}→ $(git_prompt_info)%{$reset_color%}'
+
+ZSH_THEME_GIT_PROMPT_PREFIX="λ %{$fg[blue]%}git %{$fg[red]%}"
+ZSH_THEME_GIT_PROMPT_SUFFIX="%{$fg[yellow]%} → %{$reset_color%}"