Merge pull request sqfmi#9 from a8ksh4/main

Added a case design

3D/beepberry-cases/slim_flat/README.md

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+# Slim, flat, minimal case for the Beepberry
+<img src=images/01.jpg width=200> <img src=images/02.jpg width=200>  
+<img src=images/03.jpg width=200> <img src=images/04.jpg width=200>  
+
+You can modify or export this design in different formats here: https://cad.onshape.com/documents/bd480b14f09d0e8bb1f02c35/w/8fd70d525d2eaf5fd9ab36e5/e/2a70bcd406a8aed3ac3e3c04?renderMode=0&uiState=6482bcb4e9963043625c78c9.  
+
+**Parts List**
+* Two printed parts
+* Two plastic screws - I used these: https://www.amazon.com/gp/product/B00GDYNJNM.  Maybe you can find silber buttonhead that match the m2.5 screws.
+* Four M2.5 scriws - I used the screws from this pack: https://www.amazon.com/gp/product/B01L06CUJG.
+* A square of the packing foam from the beepberry box to cushion the battery, about the size of the battery
+
+**Instructions**
+* Print face down/back down. Supports are totally optional on the openings.
+* Remove the top two screws from the pi.  Leave the screws holding it to the pogo pins.
+* Put the foam between the battery and PCB, orient the battery so it doesn't cross its wire.
+* Press the case together.  The foam should compress without much force.  Be careful not to damage the battery.
+* Screw together.
+* That's it!
+
+This end first:  
+<img src=images/05.jpg width=200>  
+
+Cut the foam around the big chips so airflow isn't blocked for them:  
+<img src=images/06.jpg width=200>  
+
+Battery on top:  
+<img src=images/07.jpg width=200>