Adding Ruger Mark II (MK II) 22LR Receiver by Tarty.

Pistols/22LR-Ruger_MKII_Receiver-Tarty/README.md

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+# Ruger Mark II (MK II) Receiver
+
+#### Author
+Tarty
+
+#### Version
+1.0
+
+#### Description
+
+This is a MK II ("Mark Two") receiver. This is not meant to be printed but rather machined. All units are in inches. Please forgive me for the messy drawings. A dovetail for the rear sight has not been included in the model. Not much else to it, just remember the 3 rules of shooting. I guess if you use it or modify it, give credit or just yell at me in FOSSCAD.
+
+Disclaimer: Build at your own risk.
+
+#### Construction Note
+* SEAMLESS steel tube that is 1" OD x 0.75" ID
+* The threads for the barrel are 13/16x20