Improve compile instructions in the Readme

[pwab]

The precompiled version in this repository have been compiled with Visual Studio 2019 and using the Oculus SDK 1.43.0

• Oculus SDK is never used so this should be removed from the Readme.
• It should be mentioned that you have to use Python 64-bit according to Scons error while compiling cpp bindings #12

[BastiaanOlij]

Thanks for that, just pushed changes to the readme directly into master. Let me know if the wording makes sense.

[pwab]

Just another point:
With

Make sure submodules have been downloaded.

you mean that godot-cpp is downloaded as well? I was confused about this sentence at first and I did the mistake of downloading the repository from github web instead of cloning it cleanly with git. Only then the submodules are downloaded automatically.

This is just some wording problem. I wasn't sure which submodules you mean and how I have to download them.

[BastiaanOlij]

Yup, you can always do a:

git submodule init
git submodule update

to fix it if you have git installed. It's annoying that github doesn't package the submodules when you just download the zip file. Especially seeing godot-cpp included godot-headers as a submodule so you need to do this stuff recursively