Re-add FizzBuzz example

fizzbuzz.mc

@@ -0,0 +1,14 @@
+(include str)
+(def fizzbuzz
+  (assign i 1)
+  (repeat $1
+    (assign result "")
+    (if (eq (modulo i 3) 0) (assign result (str::concat result "Fizz")))
+    (if (eq (modulo i 5) 0) (assign result (str::concat result "Buzz")))
+    (if (eq result "") (assign result i))
+    (log result)
+    (assign i (add i 1))
+  )
+)
+
+(fizzbuzz 100)