CardBox: Add building instructions

including a new picture of lid details by https://github.com/bwente

boxes/generators/cardbox.py

@@ -59,9 +59,19 @@ class FingerHoleEdge(edges.BaseEdge):
 
 
 class CardBox(Boxes):
-    """Box for storage of playingcards"""
+    """Box for storage of playing cards"""
     ui_group = "Box"
 
+    description = """
+#### Building instructions
+
+Place inner walls on floor first (if any). Then add the outer walls. Glue the two walls without finger joins to the inside of the side walls. Make sure there is no squeeze out on top, as this is goind to form the rail for the lid.
+
+Add the top of the rails to the sides and the grip rail to the lid (still missing in the picture above):
+
+![Details](static/samples/CardBox-detail.jpg)
+"""
+
     def __init__(self):
         Boxes.__init__(self)
         self.addSettingsArgs(edges.FingerJointSettings)

static/samples/samples.sha256

@@ -44,3 +44,4 @@ c8b114b57df7fc7bef7c80ee608dfa33ec6853c42a7a1a8c78615320d420ffeb  ../static/samp
 38d3a63f9332d67ffc7c7259e3145a667fc742b70656dc81d670481205a4e60d  ../static/samples/Console2-panel-detail.jpg
 39d5adbf160eb0a592307b94bc84906cd671dccb8870987b47a8440570c43ee7  ../static/samples/Console2-backwall-detail.jpg
 0d2e82f9f08cff48edf678b873f09e8aa28b729feebd0c2a0011c77f330ac7c0  ../static/samples/Atreus21.jpg
+25c8f59e9cfcc71539779c2d229226f0aa15638cdf74ca5dd9fd7ec6fe9b85b6  ../static/samples/CardBox-detail.jpg