adds more test roms

adds list of test roms and ability to load as desired
passes the Corax+ opcode test now

emma/tests/computer_tests.rs

@@ -0,0 +1,11 @@
+use emmaemu::chip8::computer::Chip8Computer;
+
+#[test]
+fn smoke() { assert!(true) }
+
+#[test]
+fn test_rom_1_works() {
+    let mut x = Chip8Computer::new();
+
+
+}