Create documentation for changing `$HOME` path on Windows

[parkerbxyz]

Windows users that have a $HOME path that points to a network drive location will experience difficulties using Git and Git Bash. Some of these difficulties include:

• Very slow Git commands

  This can happen when Git/Git Bash is installed on the network drive or when running commands from a network drive location.

• Permissions errors

  Sometimes these network drives are read-only, so commands like git config will return a PERMISSION DENIED error.

The following should fix these problems:

1. Open a Command Prompt window (Open the Start menu, type cmd, and press return)

2. Run the following command:

   setx HOME "%USERPROFILE%"
   

3. Press return. You should see SUCCESS: Specified value was saved.

4. Close the Command Prompt window

5. Open Git Bash or restart it if it was already open