add file loading

src/util.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "instruction.h"
+#include <stdio.h>
+#include <string.h>
+
+// -- TYPES -- //
+typedef struct {
+    char magic[4];
+    uint8_t version;
+    uint32_t numInstructions;
+} ROMFileHeader;
+
+typedef struct {
+    ROMFileHeader header;
+    Instruction* instructions;
+} RomFile;
+
+// -- FUNCTIONS -- //
+RomFile* readProgramFromFile(char* path);