expected-lite: add package (#2451)

packages/e/expected-lite/xmake.lua

@@ -0,0 +1,23 @@
+package("expected-lite")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/martinmoene/expected-lite")
+    set_description("expected lite - Expected objects in C++11 and later in a single-file header-only library")
+    set_license("BSL-1.0")
+
+    add_urls("https://github.com/martinmoene/expected-lite/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/martinmoene/expected-lite.git")
+
+    add_versions("v0.6.3", "b2f90d5f03f6423ec67cc3c06fd0c4e813ec10c4313062b875b37d17593b57b4")
+
+    on_install(function (package)
+        os.cp("include", package:installdir())
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include <nonstd/expected.hpp>
+            nonstd::expected<int, std::string> test() {
+                return 0;
+            }
+        ]]}, {configs = {languages = "c++11"}}))
+    end)