added coaster competition files (#37)

Author: hartk1213

Holiday_Items/2024/Summer_Coaster_Competition/CAD/Summer_Coaster_Contest.step

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+### Summer Coaster Competition
+This is a set of 3 coasters and a practical caddy to store them in. Print them, and put under glass or can of your favorite drink to keep condensed moisture from dripping down to the surface.
+
+We love mods and customizations - we included a blank coaster. Simply use modifiers in slicer to expose infill, negative space, or emboss to make your own!
+
+Recommended print settings:
+Material: We recommend printing from material with higher temperature resistance if coasters will be used outside in the sun.
+Layer height: 0.2mm 
+Extrusion width: 0.4mm 
+Wall count: 4 
+Solid top/bottom layers: 5
+
+Cheers!
+
+
+#### Why a .3mf?
+We've shared a .3mf file for this item as well as .STLs because we feel it looks the best when printed in multiple colors. This can be done easily with an MMU device.
+
+#### Some fun renders, courtesy of HartK1213:
+
+![Render 1](./Images/coaster_render.png)
+
+
+