add Pony language

samples/Pony/circle.pony

@@ -0,0 +1,30 @@
+use "collections"
+
+class Circle
+  var _radius: F32
+
+  new create(radius': F32) =>
+    _radius = radius'
+
+  fun ref get_radius(): F32 =>
+    _radius
+
+  fun ref get_area(): F32 =>
+    F32.pi() * _radius.pow(2)
+
+  fun ref get_circumference(): F32 =>
+    2 * _radius * F32.pi()
+
+actor Main
+  new create(env: Env) =>
+
+    for i in Range[F32](1.0, 101.0) do
+      let c = Circle(i)
+
+      var str =
+        "Radius: " + c.get_radius().string() + "\n" +
+        "Circumference: " + c.get_circumference().string() + "\n" +
+        "Area: " + c.get_area().string() + "\n"
+
+      env.out.print(str)
+    end