Add Fizz Buzz in Nim (#4323)

Author: Kaamkiya

archive/n/nim/fizz_buzz.nim

@@ -0,0 +1,9 @@
+for i in 1..100:
+  if i mod 15 == 0:
+    echo "FizzBuzz"
+  elif i mod 5 == 0:
+    echo "Buzz"
+  elif i mod 3 == 0:
+    echo "Fizz"
+  else:
+    echo i