Adding AR-15 22LR Lower Receiver by FreeMenDontAsk.

Rifles/AR-15-22LR_Lower_Receiver-FreeMenDontAsk/README.md

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+# AR-15 .22 LR Lower Receiver
+
+#### Author
+FreeMenDontAsk
+
+#### Version
+1.0
+
+#### Description
+This is an AR-15 .22 LR lower receiver by FreeMenDontAsk.
+
+#### Printing
+* Print lower 99% infill quality PLA with support
+* Print both the brace and buffer tube without supports standing upright
+* Print the brace at 99% infill concentric, buffer tube 40% infill lines shell 4 outer walls