tcb-span: add package (#5277)

packages/t/tcb-span/xmake.lua

@@ -0,0 +1,17 @@
+package("tcb-span")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/tcbrindle/span")
+    set_description("Implementation of C++20's std::span for older compilers")
+    set_license("BSL-1.0")
+
+    add_urls("https://github.com/tcbrindle/span.git")
+
+    add_versions("2022.06.15", "836dc6a0efd9849cb194e88e4aa2387436bb079b")
+
+    on_install(function (package)
+        os.cp("include", package:installdir())
+    end)
+
+    on_test(function (package)
+        assert(package:has_cxxincludes("tcb/span.hpp", {configs = {languages = "c++11"}}))
+    end)