mechanical: Import all design files for the icE1usb case

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/mechanical/icE1usb-case/doc/akg_55_24.dxf b/mechanical/icE1usb-case/doc/akg_55_24.dxf
new file mode 100644
index 0000000..0ee07d4
--- /dev/null
+++ b/mechanical/icE1usb-case/doc/akg_55_24.dxf
@@ -0,0 +1,4550 @@
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