Added gitignore, license info, and submodule

.gitignore

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+# G-Code
+*.g
+*.gco
+*.gcode
+*.nc
+
+# Exported files
+*.stl
+*.off
+*.amf
+*.dxf
+*.svg
+*.csg

.gitmodules

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+[submodule "pd-buddy-openscad"]
+	path = pd-buddy-openscad
+	url = https://git.clayhobbs.com/pd-buddy/pd-buddy-openscad.git

README.md

@@ -1,3 +1,7 @@
 # usb-pd-bench-supply-housing
 
-Housing for a bench power supply made from a PD Buddy Sink and a DPH3205.
+Housing for a bench power supply made from a PD Buddy Sink and a DPH3205.
+
+## Licensing
+
+This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.

pd-buddy-openscad

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+Subproject commit 3b188155c8cb8dec50d20833e18f50c173bacdce