Added README.md

Added README.md and cleaned up some commented values. Set rot for animation range.
Should be almost ready for initial public release.

README.md

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+# GearHinge
+
+GearHinge is an openscad model of a geared hinge. This was developed as part 
+of another project, but stands on its own as a part that could be re-used.
+
+It is designed to be printed in place and without support materials. Gears
+should be rotates into the case (rot = 0) for printing.
+
+## usage
+
+```openscad
+include <GearHinge.scad>
+
+$incolor = true;
+
+gear_hinge(rot=rot, box=false, rounded_case=true);
+```
+
+## Status/Known Issues
+
+Under development, not ready for the unadventurous.
+
+1. Arms have no mounting holes for general use.
+2. No functions/workflow exists for attaching arms to anything else.
+3. Module is 1.45; it should be parametric. Hard coded values must go.
+4. Cannot be assembled or disassembled; must be printed in place.
+5. Helix angle can only do a single "turn". Should be re-written to use sin.
+
+## License
+
+See License.txt file