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This repository was for the PoC phase. The PR is open, mainly waiting
for approval. Maintaining two independent repositories would be too
much work.

Appdata was renamed to metainfo. This should be represented by new
flatpaks. This patch should make sure this change is represented by
renaming the file `com.parsecgaming.parsec.appdata.xml` to
`com.parsecgaming.parsec.metainfo.xml`.

References:
https://www.freedesktop.org/software/appstream/docs/chap-Quickstart.html

Currently the flatpak contains the parsec client when once it's built.
This is obviously a problem due to nature of proprietary licenses a
re-dustribution is usually not allowed. Therefore this patch changes the
behavior of the flatpak to use the extra-data to download the parsec.deb
on install. This way the license restrictions are all met and It's fit
for distribution through flathub.

This patch adds a note about the requirement of a parsec account in
order to use this application.

As Parsec will greet you with a login screen, this patch adds the login
screen as screenshot to the parsec flatpak. It should hlep to provide
awareness of that fact.

Add some more words about what Parsec is and what one can do with it.

This patch adds the screenshots for the app, to make the representation
on Flathub as well as the Gnome Software Center a bit more appealing.

App metadata can recommend controls for an application. This patch adds
mouse, keyboard and gamepad as recommended input controls, because one
of the main features is nice gamepad support.

Note: Gamepad support is currently untested with the flatpak.

Since reworking the `com.parsecgaming.parsec.json` to
`com.parsecgaming.parsec.yml` the README instructions are incorrect.

As yaml is nicer to write than JSON providing the build instruction as
yaml instead of json should help to reduce typo and other mistakes in
future modifications.

This patch rewrites the build instruction file to be YAML and this way
improves the future development process.

This README should help to instruct people on how to use the repository
as well as providing an overview of the TODOs for the project.

This commit lays the groundwork for a parsec flatpak.

What to expect from this commited version?

- Provides a first working version of the parsec
- Provides a desktop entry for the parsec client
- Provides minimum required permissions to run the client
- Provides proper content rating

What's still missing?

- Does not provide a flatpak that is distributable (due to license
  issues)
- Misses screenshots in appdata
- Misses automatic-updatablity due to missing version information
- Misses some better filled description fields

Knowledge so far:

The parsec client requires it's library in the user's home directory. It
doesn't pick it up when located in a proper libs directory. Therefore
the current solution is to symlink it into the app's $HOME directory.

It also stores the user login data in a file called user.bin in the home
directory instead of using a proper `XDG_DATA_HOME` or even better a
keyring to store those login data. This is currently solved by creating
another symlink for this file and lead it to the `XDG_DATA_HOME` instead
in order to persist logins over restarts of the flatpak.

Some positive aspects: The parsec clients picks up the VAAPI integration
properly and uses hardware rendering on Intel integrated graphics to
provide nice rendering performance.

It also supports wayland and therefore the x11 session is made optional
using the `fallback-x11` permission.

All in all, for a first working version it was more work than expected
but not enough work to make me run away in tears. Further polishing can
start now as well as submission to flathub.