Initial valve setup and tf2 game setup

src/errors.rs

@@ -0,0 +1,15 @@
+use core::fmt;
+use std::fmt::Formatter;
+
+#[derive(Debug, Clone)]
+pub enum GDError {
+    IDK(String)
+}
+
+impl fmt::Display for GDError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            GDError::IDK(details) => write!(f, "IDK: {details}")
+        }
+    }
+}