[mem] Add mapped memory

src/emu/endian.rs

@@ -0,0 +1,15 @@
+
+/// read a 24bit endian value, and place it in a u32 num
+pub fn read_big_endian_tribyte(input:&[u8;3]) ->u32{
+    todo!()
+}
+
+pub fn read_big_endian_byte_array(input:&[u8]) ->u32{
+    todo!()
+}
+
+
+/// Get 24 bit big endian slice
+pub fn get_big_endian(input:u32)->[u8;3]{
+    todo!()
+}