Added inside of Vim indicator to the Sorin theme.

themes/sorin/prompt_sorin_setup

@@ -40,7 +40,7 @@ function prompt_sorin_setup() {
   zstyle ':omz:plugin:git:prompt' rprompt '%A%B%S%a%d%m%r%U%u'
 
   PROMPT='%F{cyan}%1~%f${git_prompt_info} %(!.%B%F{red}#%f%b.%B%F{green}❯%f%b) '
-  RPROMPT='%(?::%F{red}⏎%f)${git_rprompt_info}'
+  RPROMPT='%(?::%F{red}⏎%f)${VIM:+" %B%F{green}V%f%b"}${git_rprompt_info}'
   SPROMPT='zsh: correct %F{red}%R%f to %F{green}%r%f [nyae]? '
 }