Create xmake.lua (#755)

packages/s/simde/xmake.lua

@@ -0,0 +1,18 @@
+package("simde")
+
+    set_kind("library", {headeronly = true})
+    set_homepage("simd-everywhere.github.io/blog/")
+    set_description("Implementations of SIMD instruction sets for systems which don't natively support them.")
+
+    set_urls("https://github.com/simd-everywhere/simde/releases/download/v$(version)/simde-amalgamated-$(version).tar.xz")
+
+    add_versions("0.7.2", "544c8aac764f0e24e444b1a7842d0314fa0231802d3b1b2020a03677b5be6142")
+
+    on_install(function (package)
+        os.cp("*", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cincludes("x86/sse.h"))
+        assert(package:has_cincludes("arm/neon.h"))
+    end)