change cash at hand ID from 8 to 117

Merge branch 'main' of https://github.com/mikemathu/Point-Of-Sale-System

Update database with null enforcement

Update README.md with typo correction

Update book reference links in readme file

Update grammenr error in read me file api config instruction

Add UpdateOrderedItemDto class, register it in the mapper and use it in the UpdatPointofSaleQuantity action method

Reupload sql and json files

Refactor dashboard associted files while examiningits workflow

Update readme file with login instructions

Add ERDiagrams images into the AppData images directory

Update readme file adding all the project screenshots links

Add all app screenshots to AppData/images directory and include their link in the read me file

Update fiscal period image link in README.md

Add images to app data and reference fiscal period image in the readme file