Added file IO operations, and argument parcing

include/file_io/files.cpp

@@ -0,0 +1,10 @@
+#include "files.h"
+
+u_char file_exists(const char *filename) {
+    FILE *file = fopen(filename, "r");
+    if (file) {
+        fclose(file);
+        return 1; // File exists
+    }
+    return 0; // File does not exist
+}

include/file_io/files.h

@@ -0,0 +1,10 @@
+#ifndef FILES__H_INCLUDED
+#define FILES__H_INCLUDED
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+u_char file_exists(const char *filename);
+
+#endif // FILES__H_INCLUDED