add README with pics

README.md

@@ -0,0 +1,32 @@
+# Parametric Box
+
+This FreeCad project generates a box with a sliding lid and finger-shaped interlocking joints.
+It is designed to be manufactured on a CNC mill.
+
+![](pictures/pic1.png)
+
+The following parameters can be set in the spreadsheet:
+ - height (outer dimension)
+ - width (outer dimension)
+ - depth (outer dimension)
+ - finger width
+ - clearance for glued parts
+ - clearance for sliding lid
+ - slot depth in relation to material thickness
+ - material thickness (sides)
+ - material thickness (bottom)
+ - material thickness (top)
+
+#### Example for a very flat box
+*notice*: The height and the finger width must be choosen in a way that at least three fingers can fit on a corner edge
+
+![](pictures/pic2.png)
+
+### TechDraw
+
+The project includes a TechDraw page, which can be used for CNC-milling when exported as `.dxf`.
+All Views are updated and placed automaticly, when parameters are changed. Spacing can be adjusted in the Spreadsheet
+
+![](pictures/techdraw1.png)
+
+![](pictures/techdraw2.png)