feat: add valve protocol query example

CHANGELOG.md

@@ -6,6 +6,7 @@ Who knows what the future holds...
 - [Valheim](https://store.steampowered.com/app/892970/Valheim/) support.
 - [The Front](https://store.steampowered.com/app/2285150/The_Front/) support.
 - [Conan Exiles](https://store.steampowered.com/app/440900/Conan_Exiles/) support.
+- Added a valve protocol query example.
 
 ### Breaking:
 Game:

examples/valve_protocol_query.rs

@@ -0,0 +1,23 @@
+use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+use std::time::Duration;
+use gamedig::protocols::types::TimeoutSettings;
+use gamedig::protocols::valve;
+use gamedig::protocols::valve::{Engine, GatheringSettings};
+
+fn main() {
+    let address = &SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 27015);
+    let engine = Engine::Source(None); // We don't specify a steam app id, let the query try to find it.
+    let gather_settings = GatheringSettings {
+        players: true, // We want to query for players
+        rules: false, // We don't want to query for rules
+        check_app_id: false, // Loosen up the query a bit by not checking app id
+    };
+
+    let read_timeout = Duration::from_secs(2);
+    let write_timeout = Duration::from_secs(3);
+    let retries = 1; // does another request if the first one fails.
+    let timeout_settings = TimeoutSettings::new(Some(read_timeout), Some(write_timeout), retries).unwrap();
+
+    let response = valve::query(address, engine, Some(gather_settings), Some(timeout_settings));
+    println!("{response:#?}");
+}