Add docs about how use ash with vulkano

docs/USE_ASH_METHODS.md

@@ -0,0 +1,15 @@
+# Informations
+
+```rust
+let fns = vulkano_context.instance().fns();
+let mut props = ash::vk::PhysicalDeviceProperties::default();
+
+unsafe {
+    (fns.v1_0.get_physical_device_properties)(
+        vulkano_context.device().physical_device().handle(),
+        &mut props,
+    );
+}
+
+println!("{:?}", props);
+```