install.bat and madcad.bat

[fantasiiio]

batch files for windows

[jimy-byerley]

Hello @fantasiiio, thanks for this PR
I agree uimadcad was missing a madcad.bat launcher script for windows
Nice job for the install.bat. I personally am not skilled enough with batch to make the same

I have a concern about the install.bat: having two installation scripts brings a problem of redundancy. the installation instructions will need to be duplicated (and maintained equivalent) between install.sh and install.bat
I didn't put such script before because I thought it was easy enough to install bash on windows

What is your opinion ? Do you think a duplicate is worth it ?