Add zsh related dotfiles and update vimrc

cowley.zsh-theme

@@ -0,0 +1,16 @@
+# Copy this file to the "$HOME/.oh-my-zsh/custom/themes/" directory.
+# This theme includes a python virtual env indicator in the prompt.
+
+VIRTUAL_ENV_DISABLE_PROMPT=true
+
+PROMPT="%(?:%{$fg_bold[green]%}➜ :%{$fg_bold[red]%}➜ ) %{$fg[cyan]%}%c%{$reset_color%} "
+PROMPT+='$(git_prompt_info)'
+PROMPT+='$(venv_prompt_info)'
+
+ZSH_THEME_GIT_PROMPT_PREFIX="%{$fg_bold[yellow]%}("
+ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%} "
+ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg_bold[yellow]%}) %{$fg[yellow]%}✗"
+ZSH_THEME_GIT_PROMPT_CLEAN="%{$fg_bold[yellow]%})"
+
+ZSH_THEME_VENV_PROMPT_PREFIX="%{$fg_bold[green]%}("
+ZSH_THEME_VENV_PROMPT_SUFFIX=")%{$reset_color%} "