Add deprecation notice to header file

Author: christophfroehlich

parameter_traits/include/parameter_traits/parameter_traits.hpp

@@ -32,6 +32,15 @@
 #include <rsl/algorithm.hpp>
 #include <tl_expected/expected.hpp>
 
+#define PARAMETER_TRAITS_HEADER_DEPRECATION This header is obsolete, \
+  please include "rsl/algorithm.hpp" for rsl::contains and rsl::is_unique, \
+  and "tl_expected/expected.hpp" for tl::expected.
+#ifdef _MSC_VER
+#pragma message(PARAMETER_TRAITS_HEADER_DEPRECATION)
+#else
+#warning PARAMETER_TRAITS_HEADER_DEPRECATION
+#endif
+
 namespace parameter_traits {
 
 using Result