Adding the Vanguard AR-15 Lower Receiver by shadowfall.

Rifles/AR15_Vanguard_v1-shadowfall/README.md

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+# Vanguard AR-15 Receiver 
+
+#### Author
+shadowfall
+
+#### Version 
+1.0 
+
+#### Description 
+The Vanguard series is designed to minimize support material and add ease of printing to the lower design. #### Instructions Set support settings to .40 (40 degrees). If your printer cannot print 40 degree overhangs a higher number may be chosen, this will increase printing time. An 8" build platform is required for this version. The model should be oriented horizontally as seen in the renders. 
+
+#### Changelog Vanguard 1.0 
+* based off the hermes 1.3.3 model 
+* increased depth of front take down lug recess. 
+* removed portions of the bottom of the trigger pocket -added spring guides for the trigger.
+* expanded buffer end plate hole. 
+* redesigned magwell profile for ease of printing. 
+* removed majority of fillets. 
+* reprofiled the buffer reinforcement to reduce support required.