How to create a textile billing and inventory system using google spreadsheet and google app sheet

Hi 

We have created a textile inventory and billing system for Nijeeshma tailoring athanikkal kozhikode using google app sheet and google spreadsheet. Any one can develop this application with a day or two. No coding required

Please visit our git url

https://github.com/cheetah0203/nijeeshmatailoringApp/wiki

Video

https://www.youtube.com/watch?v=faBraLnBHkM