add thread-pool package (#1403)

* add thread-pool package

* fix indent

packages/t/thread-pool/xmake.lua

@@ -0,0 +1,26 @@
+package("thread-pool")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/bshoshany/thread-pool")
+    set_description("BS::thread_pool: a fast, lightweight, and easy-to-use C++17 thread pool library")
+    set_license("MIT")
+
+    add_urls("https://github.com/bshoshany/thread-pool/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/bshoshany/thread-pool.git")
+    add_versions("v3.3.0", "b76c0103c7ed07c137bd5b1988b9c09da280bbbad37588a096d2954c8d996e0f")
+
+    on_install(function (package)
+        os.cp("BS_thread_pool.hpp", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({
+            test = [[
+                #include <BS_thread_pool.hpp>
+                static void test() {
+                    BS::thread_pool pool;
+                    std::future<int> my_future = pool.submit([] { return 42; });
+                    std::cout << my_future.get();
+                }
+            ]]
+        }, {configs = {languages = "c++17"}, includes = {"BS_thread_pool.hpp"}}))
+    end)