Adding AR15000 AR-15 Lower Receiver by Ivanthetroll.

Rifles/AR-15-AR15000_Lower_Receiver-IvanTheTroll/README.md

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+# AR15000 AR-15 Lower Receiver
+
+#### Author
+Ivanthetroll
+
+#### Version 
+1.0
+
+
+#### Description
+This is Ivanthetroll's version of the FOSSCAD AR-15 Lower Receiver v5.1GS by cb.
+
+It features a reinforced front takedown pin location as well as two rafts to help combat warp when printing in ABS.
+
+For all build parameters, refer to the README.md for the FOSSCAD AR-15 Lower Receiver v5.1GS by cb.