start to add while loop

test/runners/fibo_while.rb

@@ -0,0 +1,13 @@
+def fibonaccit(n)
+  a = 0 
+  b = 1
+  while n > 1 do
+    tmp = a
+    a = b
+    b = tmp + b
+    puts b
+    n = n - 1
+  end
+end
+
+fibonaccit( 10 )