add Pony language

samples/Pony/counter.pony

@@ -0,0 +1,32 @@
+use "collections"
+
+actor Counter
+  var _count: U32
+
+  new create() =>
+    _count = 0
+
+  be increment() =>
+    _count = _count + 1
+
+  be get_and_reset(main: Main) =>
+    main.display(_count)
+    _count = 0
+
+actor Main
+  var _env: Env
+
+  new create(env: Env) =>
+    _env = env
+
+    var count: U32 = try env.args(1).u32() else 10 end
+    var counter = Counter
+
+    for i in Range[U32](0, count) do
+      counter.increment()
+    end
+
+    counter.get_and_reset(this)
+
+  be display(result: U32) =>
+    _env.out.print(result.string())