games: added cs2

wiki/games/counter-strike_2.md

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+# Counter-Strike 2
+
+[Counter-Strike 2](https://www.counter-strike.net/cs2) is a tactical first-person shooter developed
+by [Valve](https://www.valvesoftware.com/en/).
+It is distributed via [Steam](./steam.md).
+
+## Troubleshooting
+
+### Problems launching on [Steam](/wiki/games/steam.md)
+
+On [Linux](/wiki/linux.md) systems launching can run into problems.
+To fix those the following line should be set as launch options in the general tab of steams game
+related settings:
+
+```sh
+gamemoderun %command% -vulkan -sdlaudiodriver pipewire -novid -high -fullscreen -nojoy
+```