add strong_type v15 (#6964)

* add strong_type v15

* Update description

* Set correct sha256 hash

packages/s/strong_type/xmake.lua

@@ -0,0 +1,20 @@
+package("strong_type")
+
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/rollbear/strong_type")
+    set_description("An additive strong typedef library for C++14/17/20.")
+    set_license("BSL-1.0")
+
+    add_urls("https://github.com/rollbear/strong_type/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/rollbear/strong_type.git")
+
+    add_versions("v15", "d445398d4c4d6795060ac2b60be146b3cd7e6039985244b2d56f9bc333f20bae")
+
+    add_deps("cmake")
+    on_install(function (package)
+        import("package.tools.cmake").install(package, {"-DSTRONG_TYPE_UNIT_TEST=OFF"})
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets("using myint = strong::type<int, struct my_int_>;", {configs = {languages = "c++14"}, includes = "strong_type/strong_type.hpp"}))
+    end)