Windows/Cygwin support

[laheller]

@knro

As the title says.
To build INDI also all the required Cygwin packages must be installed. Since libnova is not prebuilt for Cygwin, it must be also built from sources and installed.

[knro]

@laheller Thanks! Do you think you can write a Step by Step guide on how to get this accomplished exactly? That would be greatly appreciated and we can add it to the official documentation.

[laheller]

@laheller Thanks! Do you think you can write a Step by Step guide on how to get this accomplished exactly? That would be greatly appreciated and we can add it to the official documentation.

@knro
Do you mean a complete guide, how to install Cygwin, required packages, dependencies and how to build INDI?

[knro]

Right for someone who has no idea how to do this.

[laheller]

Right for someone who has no idea how to do this.

@knro

OK, I am going to write a step-by-step guide, but where to add it?
Do I have to extend the README or INSTALL or create a new file?

BR,

Ladislav

[knro]

Create a new README.Cygwin file as you suggested before, perhaps link it (if possible) in the Main readme file

[laheller]

@knro

Included in the latest commit.