Add ui::image_provider interface

libs/ui/include/psemek/ui/image_provider.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <psemek/gfx/texture_view.hpp>
+
+#include <string_view>
+
+namespace psemek::ui
+{
+
+	struct image_provider
+	{
+		virtual gfx::texture_view_2d get(std::string_view const & id) = 0;
+
+		virtual ~ image_provider() {}
+	};
+
+}