Add article about anti-ooze retraction speed

Hope I'm not giving too much away here.

resources/articles/material_anti_ooze_retraction_speed.md

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+For some printers, when a material is retracted for a filament switch, the material needs to be broken off cleanly in order to move it through the feeder without tangling. This setting configures part of the procedure to break it cleanly.
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+This setting adjusts the speed at which the material is retracted towards the first position in order to stop it from oozing. The material is not yet broken off at this point. The purpose is only to quickly remove the pressure on the nozzle chamber by pulling it inwards.
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+![First, the material is retracted to stop oozing, as per this setting](images/filament_switch_anti_ooze.svg)
+![Secondly, the filament is slowly retracted to draw a thin thread that is easy to break and let this thread solidify](images/filament_switch_break_preparation.svg)
+![Thirdly, the filament is quickly retracted further to break off the filament](images/filament_switch_break.svg)
+
+**This setting is currently never visible in Cura's interface. It can only be set by the profiles. It is also not used by Cura during slicing. However, printers that understand Cura's material file format may use it to configure their filament switching procedure correctly.** Through a post-processing script the `M600` command can be inserted in the print, which will trigger a filament switch.