index.html cleanup, build windows script added, readme extended

[holzkeil]

Hi, great project, would like to add some improvements, others may follow. Hope you like them and merge them

I have made the follwing changes

• index.html sanitized, I've used webstorm
• build powershell script added
• readme extended

[holzkeil]

Do you follow a certain flow? E.g. would you like to have the PRs targeting develop or master? Since your master is some commits ahead, I'd prefer master. And finally: Will you merge? :D

[bkeevil]

I was using the development branch when it was under active development but not so much anymore.