MGN9C X axis mod for V0.2 (#892)

* Add files for MGN9C X axis mod

* Add close up image

* Create README.md

* Fix incorrect markdown syntax

* Update overview README with V0.2 MGN9C mod

* Clarify usage of hardware in instructions

printer_mods/ruiqimao/V0.2_MGN9C_X/.metadata.yml

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+cad: 
+- CAD/V0.2_MGN9C_X.step
+description: MGN9C linear rail for the X axis on V0.2
+images:
+- Images/angle.png
+- Images/closeup.png
+- Images/side.png
+mod_version: 1
+printer_compatibility:
+- V0
+title: V0.2 MGN9C X Axis

printer_mods/ruiqimao/V0.2_MGN9C_X/README.md

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+# MGN9C X Axis for V0.2
+
+This mod replaces:
+
+* The stock MGN7H rail on the V0.2 X axis with an MGN9C rail
+* The stock AB drive frames with modified ones that have additional clearance for the MGN9C carriage
+
+## Additional hardware
+
+In addition to the hardware needed for the stock build:
+
+* 1x MGN9C 150mm linear rail
+* 10x M3x8 BHCS
+* 6x M3 Nuts
+
+## Instructions
+
+Assembly is the mostly the same as the stock V0.2 X axis and AB frames. The MGN9C rail mounts to the X axis extrusion with 6x M3x8 BHCS screws and nuts, and the X carriage mounts to the MGN9C carriage with 4x M3x8 BHCS screws.
+
+![Overview](Images/angle.png)
+
+![Closeup](Images/closeup.png)
+
+![Side](Images/side.png)