variant-lite: add package (#2470)

packages/v/variant-lite/xmake.lua

@@ -0,0 +1,21 @@
+package("variant-lite")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/martinmoene/variant-lite")
+    set_description("variant lite - A C++17-like variant, a type-safe union for C++98, C++11 and later in a single-file header-only library")
+    set_license("BSL-1.0")
+
+    add_urls("https://github.com/martinmoene/variant-lite.git")
+    add_versions("2022.12.03", "5015e841cf143487f2d7e2f619b618d455658fab")
+
+    on_install(function (package)
+        os.cp("include", package:installdir())
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include <nonstd/variant.hpp>
+            void test() {
+                nonstd::variant<char, int, long> var;
+            }
+        ]]}))
+    end)