update readme

README.md

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 # PicoProtect
 
-3D-Printable protection frame for PicoPlanet PCBs
+3D-Printable protection frame for PicoPlanet PCBs
+
+<img src="pictures/front.jpg"
+     alt="Front view"
+     style="float: left; margin-right: 10px;" height="500"/>
+<img src="pictures/back.jpg"
+     alt="Back view"
+     style="float: left; margin-right: 10px;" height="500"/>
+
+## Printing
+- Layer hight of 0.2mm works just fine
+- Infill: 25% works great, propably anything would work