Create readme.md

Initial description for the raspiblitz case

3D printed case/readme.md

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+# Raspiblitz Case
+This is a raspiblitz case prototype. The standard file (Raspiblitz_standard.stl) should be modified to fit your HDD. 
+
+
+#### To Do
+* Update the HDD container to fit the standard HDD model from the raspiblitz amazon buylist. (Toshiba HDTB420EK3AA 2TB Canvio Basics 2.5-Inch USB 3.0 Portable External Hard Drive - Black)
+
+* Add a cool lightning bolt to improve the design.