Add personal config for Kprepublic BM40HSRGB

[CoffeeIsLife87]

Description

This is the keymap I've been using for months at this point and I think it flows well and is easy to adjust to after coming from a larger sized board ( I was using a TKL before this )

The primary layer is a qwerty layer
The FN/Num/Nav layer is activated with the key to the immediate left of the spacebar
The RGB/Volume/Macro layer is activated with the key to the immediate right of the spacebar
There is a mouse layer that can be enabled in the makefile (uses the normal MOUSEKEY_ENABLE setting so there were no additional options to manage)

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[drashna]

There are a number of items from the PR Checklist that have not been applied. I've unchecked the "I have read the PR Checklist Document" item.

Please review the PR Checklist document and verify that you have properly followed the checklist for the type of PR this is.