rows.md in vedeu-0.8.21

- old
+ new

@@ -1,11 +1,22 @@
-@todo Add more documentation.
\ No newline at end of file
+### rows
+
+Returns the height in characters for the number of rows
+specified.
+
+    Vedeu.geometry :main_interface do
+      # ... some code
+      height rows(3)  # Vedeu.height # => 38 (for example)
+                      # 38 / 12 = 3
+                      # 3 * 3 = 9
+                      # Therefore, height is 9 characters.
+    end