move to soml ending, new while example

codes/a_while.soml

@@ -0,0 +1,12 @@
+class Object
+
+  int main()
+    int i = 5
+    while_plus(i)
+      "out".putstring()
+      i = i - 1
+    end
+    return i
+  end
+  
+end