Raspberry Pi Touchscreen Stand

This is a remix of the Touchscreen stands created by matt448. The screen edge wasn't touching the lip of the stand. Not sure if the dimensions changed or what. I took the freecad drawing and made the following changes.

1. I move the lip up by 1mm
2. I added a chamfer to the bottom of the lip just to make it less blocky
3. I added indents in the feet to accept 1/2" rubber feet

I had no need to access the USB port on the screen so I just used the modified freecad drawing for the right leg and did a mirror of it in Cura to make the left leg. This is used for a picture frame that sits on a shelf.