Heyo!
Welcome to the forums! Make sure to familiarise yourself with the forum rules 
Unfortunately this has been suggested before. Please use the search function (
) next time to look for the suggestion beforehand to avoid making a duplicate. You can find the original suggestion here.
Additionally, please bare in mind that using a resource / texture pack or client to visualise players health on the server is strictly against the rules. This can be seen on the Hives support page of allowed / disallowed modifications here.