Step 1 : You need a file explorer which has the ability to create files. ES file manager Preferable .
Step 2 : Find a folder or create a folder which doesn't create any suspicion from new ->folder (mylilsecretfolder is probably not the best name !)
Step 3 : Within the folder create a file named ".nomedia" by new -> file.
Congratulations ! you are now a android ninja ! Hurray!
Please: remember the location of the folder.
Tried the method and have any issues? let us know :)