Create README.md

Author: alotlikebeans

README.md

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+# io.github.opendriver2.Redriver2
+A complete flatpak featuring the game and the launcher. Still under testing.
+
+## Build
+The following sdks/tools are required:
+```
+flatpak --user install flathub org.freedesktop.Platform/x86_64/21.08 -y
+flatpak --user install flathub org.freedesktop.Sdk/x86_64/21.08 -y
+flatpak --user install flathub org.freedesktop.Sdk.Compat.i386/x86_64/21.08 -y
+flatpak --user install flathub org.freedesktop.Sdk.Extension.toolchain-i386/x86_64/21.08 -y
+flatpak --user install flathub org.freedesktop.Sdk.Extension.openjdk11/x86_64/21.08 -y
+```
+Build it with a recent version of `flatpak-builder`
+```
+flatpak-builder --user --install build io.github.opendriver2.Redriver2.yaml --force-clean --arch=x86_64
+```
+if you want to create a flatpak for redistribution (unnecessary)
+```
+flatpak build-bundle ~/.local/share/flatpak/repo io.github.opendriver2.Redriver2.flatpak io.github.opendriver2.Redriver2
+```
+## Testing
+The following runtimes are required:
+```
+flatpak --user remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+flatpak --user install flathub org.freedesktop.Platform/x86_64/21.08 -y
+flatpak --user install flathub org.freedesktop.Platform.Compat.i386/x86_64/21.08 -y
+flatpak --user install flathub org.freedesktop.Platform.GL32/x86_64/21.08 -y
+flatpak --user install flathub org.freedesktop.Sdk.Extension.openjdk11/x86_64/21.08 -y
+```
+now, simply run your build or [install the latest release](https://github.com/VinnyVynce/io.github.opendriver2.Redriver2/releases).