Add Fizz Buzz in Pony (#4367)

Author: Kaamkiya

archive/p/pony/fizz-buzz.pony

@@ -0,0 +1,18 @@
+use "collections"
+
+actor Main
+  new create(env: Env) =>
+    for i in Range[I32](1, 101) do
+      env.out.print(fizzbuzz(i))
+    end
+
+  fun fizzbuzz(n: I32): String =>
+    if (n % 15) == 0 then
+      "FizzBuzz"
+    elseif (n % 5) == 0 then
+      "Buzz"
+    elseif (n % 3) == 0 then
+      "Fizz"
+    else
+      n.string()
+    end