Initial valve setup and tf2 game setup

src/games/mod.rs

@@ -0,0 +1,4 @@
+
+pub mod tf2;
+
+pub use tf2::*;

src/games/tf2.rs

@@ -0,0 +1,14 @@
+use crate::errors::GDError;
+use crate::protocol::Protocol;
+use crate::protocols::valve::{Response, ValveProtocol};
+
+pub struct TF2;
+
+impl TF2 {
+    pub fn query(address: &str, port: Option<u16>) -> Result<Response, GDError> {
+        ValveProtocol::query(address, match port {
+            None => 27015,
+            Some(port) => port
+        })
+    }
+}