Add constructor comment

src/main.c

@@ -1,6 +1,10 @@
 #include <stdio.h>
-/* #include <dlfcn.h> */
 
+/*
+ * We need:
+ *   __attribute__((constructor))
+ * To indicate that this function will be the entry point once injected.
+ */
 __attribute__((constructor)) void load(void) {
     printf("hl-cheat loaded!\n");
 }