Added Memory Paging + Formating Fixes

Memory paging was "fixed", there was previously a stub because I was
working out some compilation issue. Turns out, I had extern keyword
called to the structs. Stupidly, I forgot to declare the struct in the
header the whole time. Luckily that worked itself out, and now vga
memory is mapped.

kernel/include/mm/paging.h

@@ -0,0 +1,11 @@
+#ifndef PAGING_H
+#define PAGING_H
+
+#include <limine.h>
+
+volatile struct limine_hhdm_request hhdm_request;
+volatile struct limine_kernel_address_request kernel_address_request;
+
+void map_vga_memory(void);
+
+#endif /* ifndef PAGING_H */