Rename functions in mongodb_client.go

[zaeema-n]

The functions in mongodb_client.go are named CreateEntity, ReadEntity, UpdateEntity and DeleteEntity. However, these aren't modifying the entity but the metadata- change the function names to reflect this.

[iDarkster]

Greetings, I'd like to take this up. Please assign me the issue.

[prdai]

hi @zaeema-n, i put up a pr #480 please feel free to let me know if there is any changes to be made :)) thanks!

[zaeema-n]

Hi @prdai. Thank you for your pr! I will check it out.