add avir (#1880)

packages/a/avir/xmake.lua

@@ -0,0 +1,19 @@
+package("avir")
+
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/avaneev/avir")
+    set_description("High-quality pro image resizing / scaling C++ library, including a very fast Lanczos resizer")
+    set_license("MIT")
+
+    add_urls("https://github.com/avaneev/avir/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/avaneev/avir.git")
+
+    add_versions("3.0", "011909d31cf782152a69f570563eb70700504f168174a6049b6acbb9b9f511ea")
+
+    on_install(function (package)
+        os.cp("*.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cxxincludes("avir.h"))
+    end)