add qoi (#782)

packages/q/qoi/xmake.lua

@@ -0,0 +1,16 @@
+package("qoi")
+
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/phoboslab/qoi")
+    set_description("The Quite OK Image Format for fast, lossless image compression")
+
+    add_urls("https://github.com/phoboslab/qoi.git")
+    add_versions("2021.12.22", "44fe081388c60e7618f49486865b992e08ce4de4")
+
+    on_install(function (package)
+        os.cp("qoi.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("qoi_encode", {includes = "qoi.h"}))
+    end)