Add initial HULK source and linker script

src/hulk/hulk.d

@@ -0,0 +1,16 @@
+import hulk.bootinfo;
+import hos.memory;
+import ldc.attributes;
+
+@(ldc.attributes.section(".hulk_start"))
+extern(C) void hulk_start(BootInfo * bootinfo)
+{
+    for (size_t y = 100u; y < 120u; y++)
+    {
+        memset32(&bootinfo.fb.buffer[y * bootinfo.fb.stride + 20u], 0xFF8800u, 20u);
+    }
+
+    for (;;)
+    {
+    }
+}