update readme

Signed-off-by: John Thornton <bjt128@gmail.com>

README.md

@@ -8,3 +8,18 @@ Current: adding command line flags and analyze
 At this time dxf2gcode will convert a single layer DXF file to G code.
 
 This is for G17 applications only at this time.
+
+Usage:
+GUI dxf.py
+
+Comand Line Flags
+Usage of dxf2gcode:
+  -a	Analyze contents of the file
+  -c	Convert contents of the file
+  -d string
+    	Direction of path (default "CCW")
+  -i string
+    	Input file path (default "/dxf/test.dxf")
+  -o string
+    	Output file path (default "output.ngc")
+