make sure to read this .txt file if you are having trouble installing/using the datapack.

Inside this .zip file you will find two folders:
   - MantaRays                     (which is the DATAPACK)
   - MantaRays resources           (which is the RESOURCE PACK)

DO NOT put the whole .zip file inside the datapack folder of your world, if you do then the datapack will not work.
What you have to do instead is put the folder called "MantaRays" inside the datapack folder of your world, 
and the folder called "MantaRays resources" inside the resource pack folder.

Now that both folders have been properly setup open minecraft and apply the "MantaRays resources" resource pack,
join the world with the installed datapack and type /reload. You should see a colored message appear in chat, 
that means that the datapack is installed correctly :)