RD-1: Added an inital port of d_main.c/d_main.h. Added some other basic files

src/main.rs

@@ -0,0 +1,16 @@
+mod d_main;
+mod m_argv;
+mod doomdef;
+mod math;
+
+
+/// Main entry pointz
+/// 
+fn main() {
+
+    if let Err(e) = std::panic::catch_unwind(|| {
+        d_main::D_DoomMain();
+    }) {
+        eprintln!("Panic in Doom Main: {:?}", e);
+    }
+}