add websocketpp (#1550)

* add websocketpp

* Update xmake.lua

packages/w/websocketpp/xmake.lua

@@ -0,0 +1,29 @@
+package("websocketpp")
+    set_kind("library", {headeronly = true})
+    set_homepage("http://www.zaphoyd.com/websocketpp")
+    set_description("C++ websocket client/server library")
+
+    add_urls("https://github.com/zaphoyd/websocketpp/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/zaphoyd/websocketpp.git")
+    add_versions("0.8.2", "6ce889d85ecdc2d8fa07408d6787e7352510750daa66b5ad44aacb47bea76755")
+
+    add_deps("cmake")
+    add_deps("boost")
+
+    on_install("linux", "macosx", "windows", function (package)
+        local configs = {}
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        import("package.tools.cmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include <websocketpp/config/asio_no_tls.hpp>
+            #include <websocketpp/server.hpp>
+            typedef websocketpp::server<websocketpp::config::asio> server;
+            void test() {
+                server echo_server;
+            }
+        ]]}, {configs = {languages = "c++17"}}))
+    end)