Co-authored-by: MegaMech <MegaMech@users.noreply.github.com>

* Add L&R and Gamepad to README

* Update README.md

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Co-authored-by: MegaMech <MegaMech@users.noreply.github.com>

In `portable-file-dialogs.h`, if none of `zenity`, `matedialog`,
`qarma`, `kdialog` is installed, it simply runs `echo`[1]. I'm not
sure if the intent was to fallback to readline or something, but it
seems to simply return an empty string with no indication of what
went wrong. This causes SpaghettiKart to render an error box:

> No ROM selected.
>
> Exiting...

To me this seems like a bug in `portable-file-dialogs.h`.

[1]: https://github.com/adsr/SpaghettiKart/blob/11793ed4318b35e205704c46263cc076b97d763a/include/portable-file-dialogs.h#L899

Co-authored-by: MegaMech <MegaMech@users.noreply.github.com>

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

Corrected default keyboard bindings.

Co-authored-by: MegaMech <MegaMech@users.noreply.github.com>

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Add files via upload

* Update README.md

* Updated readme

* Fixed incorrect package name for quick Ubuntu setup

* Removed needless mention of 1.0 rom from readme

* Less weird wording.

* Update README.md

---------

Co-authored-by: MegaMech <MegaMech@users.noreply.github.com>