Add "Yuzu" runner

[AymenStudios]

Add Support for Yuzu Emulater for play Nintendo Switch Games

[Adehom]

To add this emulator we need to add this runners in https://lutris.net/api/runners

   {

        "name": "Yuzu",
        "slug": "yuzu",
        "icon": "https://lutris.net/media/runners/icons/yuzu.png", #need to add this icons in this repository
        "website": "https://yuzu-emu.org/",
        "versions": [
            {
                "version": "68cb3b213",
                "architecture": "x86_64",
                "url": "https://lutris.net/files/runners/yuzu-linux-20191028-68cb3b213.tar.xz", #need to add this file in this repository
                "default": true
            }
        ]
    },

url to download installer : https://github.com/yuzu-emu/yuzu-mainline/releases/download/mainline-0-32/yuzu-linux-20191028-68cb3b213.tar.xz

[Adehom]

With @xavierdlr, we add this emulator in runner list but to install it, we need this runner in https://lutris.net/api/runners and the installer in https://lutris.net/files/runners/.

How can we add it ?

Traceback (most recent call last):
  File "/home/tony/lutris/lutris/gui/dialogs/runners.py", line 134, in on_install_clicked
    runner.install(downloader=simple_downloader)
  File "/home/tony/lutris/lutris/runners/runner.py", line 328, in install
    runner = self.get_runner_version(version)
  File "/home/tony/lutris/lutris/runners/runner.py", line 290, in get_runner_version
    runner_info = self.get_runner_info()
  File "/home/tony/lutris/lutris/runners/runner.py", line 282, in get_runner_info
    return request.get().json
  File "/home/tony/lutris/lutris/util/http.py", line 76, in get
    raise HTTPError("Request to %s failed: %s" % (self.url, error))
lutris.util.http.HTTPError: Request to https://lutris.net/api/runners/yuzu failed: HTTP Error 404: Not Found

[strycore]

This can be closed, we have support for Yuzu now.