RFR: 6945: Create build script for Windows

[Guru Hb]

On Fri, 30 Oct 2020 21:22:26 GMT, Jean-Philippe Bempel <github.com+4610701+jpbempel at openjdk.org> wrote:

> Build script for windows mimics behavior of the *nix one
> 
> Special handling for Jetty server with killing it at the end of the action

Let me check on Windows build and update my comments.

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PR: https://git.openjdk.java.net/jmc/pull/147