Add `plf_nanotimer` package (#3751)

* Add `plf_nanotimer` package

* disable wasm, simplify test

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Co-authored-by: star9029 <[email protected]>

packages/p/plf_nanotimer/xmake.lua

@@ -0,0 +1,16 @@
+package("plf_nanotimer")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://plflib.org/nanotimer.htm")
+    set_description("A cross-platform lowest-overhead microsecond-precision timer for simple benchmarking on Linux/BSD/Windows/Mac.")
+    set_license("zlib")
+
+    add_urls("https://github.com/mattreecebentley/plf_nanotimer.git")
+    add_versions("v1.07", "55e0fcb135ec8db874a0656f94d1f1780d7c75a7")
+
+    on_install("!wasm", function (package)
+        os.cp("plf_nanotimer.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cxxtypes("plf::nanotimer", {configs = {languages = "c++17"}, includes = "plf_nanotimer.h"}))
+    end)