Added version with rail notch

Added version with a rail notch / cut-out for V2.2 and V2.4 style covers, step and stl.
Adapted description to include information about the rail notch version and when to use it.
Adapted description and added pictures of the rail notch version.

printer_mods/Akio/cable_routing_z_belt_cover/README.md

@@ -2,6 +2,9 @@
 ## Credit
 Mod based on the design of the Voron crew.
 Thank you for your awesome work!
+&nbsp;<br/>
+A big thank you goes to [Mbravorus](https://github.com/mbravorus) as well, for contributing the rail notch version.
+
 ## Print settings
 As stated in the Voron documentation:
 * ABS
@@ -26,7 +29,7 @@ the z belt cover a bit thicker and cut a path on the bottom where cables can be
 The files are named with v2.2 in the filename for the 2.2 version and v2.4 in the filename for the 2.4 version.
 
 ## Things to consider during installation
-> The modified z belt covers are thicker than the originals. You may have to move up your z-rails, if you installed them flush to the top of the original covers.
+> The modified z belt covers are thicker than the originals. You may have to move up your z-rails, if you installed them flush to the top of the original covers. If you don't want to do this you can use the rail notch version, which has a cut-out for the rails.
 
 > Make sure to constrain the cable you are routing through to the bottom, so it does not interfere with the z-belts. Use a zip tie or tape to hold the cable securely in position / away from your z-belts.
 ## Pictures
@@ -56,6 +59,12 @@ The files are named with v2.2 in the filename for the 2.2 version and v2.4 in th
 ![z belt cover 2.4 bottom](img/cable_routing_z_belt_cover_mod_v2.4_img_1.png)
 *2.4 version - bottom with path for routing cables*
 
+![z belt cover 2.4 rail notch](img/cable_routing_z_belt_cover_mod_rail_notch_v2.4_img_2.png)
+*2.4 version - top with rail notch*
+
+![z belt cover 2.4 rail notch](img/cable_routing_z_belt_cover_mod_cross_section_view_rail_notch.png)
+*2.4 version - cross section view of the rail notch version*
+
 ## Wire routing
 ![z belt cover](img/cable_routing_z_belt_cover_mod_cable_routing.png)
 *The cable needs to be wired like this below the cover*