Hi bro. Although there are many methods for modding, but best way out is to use apktool. You can search on XDA about how to use apktool.
Hit thanks if i helped you
Sent from my GT-S5302 using xda app-developers app
Akshay Kumar Raheja
©Darkjbrom | GT-S5302
Sent from my GT-S5302 using DARK JB ROM