civ 6: added proton fix

wiki/games/sid_meier's_civilization_vi.md

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+# Sid Meier's Civilization VI
+
+[Sid Meier's Civilization VI](https://civilization.com/de-DE/) is a round-based
+strategy game which is available as a standalone Launcher for Windows and on
+[Steam](./steam.md) and many other video game distribution services.
+
+## Problems launching with [Proton](./steam.md)
+
+Due to the standalone launcher of Civilization VI being used in the startup
+process of [steam](./steam.md), it can be useful to skip the launcher by
+setting the following line as `Launch Options` in the `General` tab of
+[steams](./steam.md) game related settings:
+
+```sh
+eval $( echo "%command%" | sed "s/2KLauncher\/LauncherPatcher.exe'.*/Base\/Binaries\/Win64Steam\/CivilizationVI'/" )
+```
+