Added my own theme.

themes/takashiyoshida.zsh-theme

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+#
+# PROMPT
+#
+PROMPT_BRACKET_BEGIN='%{$fg_bold[white]%}['
+PROMPT_HOST='%{$fg_bold[cyan]%}%m'
+PROMPT_SEPARATOR='%{$reset_color%}:'
+PROMPT_DIR='%{$fg_bold[yellow]%}%c'
+PROMPT_BRACKET_END='%{$fg_bold[white]%}]'
+
+PROMPT_USER='%{$fg_bold[white]%}%n'
+PROMPT_SIGN='%{$reset_color%}%#'
+
+GIT_PROMPT_INFO='$(git_prompt_info)'
+
+# My current prompt looks like:
+# [host:current_dir] (git_prompt_info)
+# [username]%
+PROMPT="${PROMPT_BRACKET_BEGIN}${PROMPT_HOST}${PROMPT_SEPARATOR}${PROMPT_DIR}${PROMPT_BRACKET_END}${GIT_PROMPT_INFO}
+${PROMPT_BRACKET_BEGIN}${PROMPT_USER}${PROMPT_BRACKET_END}${PROMPT_SIGN} "
+
+#
+# Git repository
+#
+ZSH_THEME_GIT_PROMPT_PREFIX=" on %{$fg[magenta]%}"
+ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%}"
+ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[green]%}!"
+ZSH_THEME_GIT_PROMPT_CLEAN=''