counter-strike-2: add page

pages/linux/counter-strike-2.md

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+# counter strike 2
+
+> Host a headless Counter Strike 2 server.
+> More information: <https://developer.valvesoftware.com/wiki/Counter-Strike_2/Dedicated_Servers>.
+
+- Run a game with one map:
+
+`{{path/to/cs2}} -dedicated +map {{de_dust2}}`
+
+- Run a game with specified maximum number of players:
+
+`{{path/to/cs2}}  -dedicated +map {{de_dust2}} -maxplayers {{64}}`
+
+- Run a game with specified server IP and port:
+
+`{{path/to/cs2}} -dedicated +map {{de_dust2}} -ip {{1.2.3.4}} -port {{27015}}`
+
+- Shut the server down:
+
+`quit`

pages/linux/cs2.md

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+# cs2
+
+> This command is an alias of `counter strike 2`.
+
+- View documentation for the original command:
+
+`tldr counter strike 2`