Here's a README, in case this was really necessary

README.md

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+# Steam Play - FTEQW
+
+If you'd like a convenient way to use your system binary of FTEQW
+in order to run games such as:
+
+- Quake
+- Quake Mission Pack 1: Scourge of Armagon
+- Quake Mission Pack 2: Dissolution of Eternity
+- Quake II
+- Quake II Mission Pack 1: The Reckoning
+- Quake II Mission Pack 2: Ground Zero
+- Quake III Arena
+- Quake III: Team Arena
+- HeXen II
+
+Then this is the right tool for you.
+
+# Dependencies
+None, it expects your /bin/sh to handle arrays and things though.
+And you want fteqw installed. Put it into $HOME/bin if that's in your $PATH
+or something. You'll figure it out.
+
+# Installation
+In order to install it, you just clone
+the repository into your $HOME/.steam/steam/compatibilitytools.d/ directory.
+
+If the directory 'compatibilitytools.d' does not exist, make sure to create it.
+
+# License
+
+Copyright (c) 2021 Marco "eukara" Hladik
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.