add jsmn (#656)

packages/j/jsmn/xmake.lua

@@ -0,0 +1,19 @@
+package("jsmn")
+
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/zserge/jsmn")
+    set_description("Jsmn is a world fastest JSON parser/tokenizer")
+
+    set_urls("https://github.com/zserge/jsmn/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/zserge/jsmn.git")
+
+    add_versions("v1.1.0", "5f0913a10657fe7ec8d5794ccf00a01000e3e1f2f1e1f143c34a0f7b47edcb38")
+
+    on_install(function (package)
+        os.cp("jsmn.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("jsmn_parse", {includes = "jsmn.h"}))
+    end)
+