Add list of compositors using Louvre to the read me

[wiki-me]

Continuing our discussion from here.

I suggest having a link rather then a full list like in smithay, as that would make the read me a little easier to skim , Also i don't think a wiki should be used because iirc it's can't be easily edited with a pull request, linking to some other file in markdown is good.

[ehopperdietzel]

Ok, I will create a new branch named "gallery" or similar with a README.md, the format should be something like this?

Louvre Compositors Showcase

Welcome to the list of compositors using Louvre. If you'd like to showcase your compositor, follow the steps below:

List of Compositors Using Louvre

• Compositor Name 1 : A floating window style compositor.
• Compositor Name 2 : A tiling window style compositor.
• Compositor Name 3 : A 3D compositor (Work in Progress).

Add Your Compositor

1. Click the edit (pencil) button at the top right corner.
2. Add your compositor following the format: * [Your Compositor Name](Link to the project) : Description.
3. Make sure to insert the line in alphabetical order among the existing compositors
4. Save your changes and create a pull request.

[ehopperdietzel]

Here is the README.md, feel free to modify it if you wish.