Adding Steyr Pistol Magazine Extension by crysys.

Pistols/Steyr_Pistol_Magazine_Extension-crysys/README.md

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+# Steyr Pistol Magazine Extension
+
+#### Author 
+crysys 
+
+#### Version 
+2.5
+
+#### Description
+A replacement bottom cap for Steyr 9mm pistol magazines. This one adds three rounds to the 17 round factory magazine, or 5 rounds if you have the older 15 round magazine though it is not tested. The components are front and back magazine cap pieces and a new spring plate. The spring plate is thin and should be reinforced with a small piece of sheet metal cut to fit underneath it. Larger sizes may be added if they are tested and found to function.
+
+Print these three pieces, front and back cap faces down and spring plate on back end. Trim front and back pieces until they fit, glue together.  Cut a small piece of sheet metal in shape of the bottom of spring plate, ensure it fits in bottom of cap.  Reassemble magazine with new parts.
+
+The cap pieces are designed to be easy to make on most printers. The spring plate is delicate and can be a challenging print, use plenty of support. I recommend ABS, PLA is likely too brittle and is untested.
+
+If you have problems or improvements visit the IRC channel #fosscad on irc.oftc.net.
+
+pew pew