Turn project into a custom Unity package

[cyrilBoucher]

• Add the necessary package.json file to describe what this package will
  contain
• Move files into a Runtime folder to follow package layout found here:
  https://docs.unity3d.com/Manual/cus-layout.html

[cyrilBoucher]

@HiddenMonk Hi! I created a pull request to make your project usable through the package manager. The PR says it will be merged into master but I am not sure if that should be the case, other repositories like https://github.com/ValveSoftware/steamvr_unity_plugin have a specific branch for the package and other branches are just the normal Unity project layout (Asset folder, etc...).

That's why I made it a draft so that it does not get merged by mistake.

Maybe the right way to do this would be for you to have a specific branch and I could merge into that one? What do you think?

EDIT: Actually they recently removed said branch...

[HiddenMonk]

Hey =), thats really cool, I didnt know you can make custom packages for unity to grab from github.
However, I dont want to worry about managing it since I dont know much about this stuff and might not be working on this gizmo anymore, but I put your fork in the ReadMe so people can see your version for the package manager, if thats all right with you.

[cyrilBoucher]

Yup, I totally understand! On top of that, Unity doesn't seem to make it easy to manage... I am good with a simple link in the ReadMe for anyone interested in using it that way! I will proceed and close the PR!

[HiddenMonk]

=) sounds good. Up to you to close the pr, I dont mind it open for people to have another way to find it.

[cyrilBoucher]

True! I will leave it open as a Draft then!