Added README and screenshot for bezel

bezel/README.md

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+Bezel Engraving Software
+========================
+
+**Download**: [bezel.py](https://github.com/njh/simple-gcode-generators/raw/master/bezel/bezel.py)
+
+This software engraves a bezel like you would see on the front panel of a stereo around the volume control knobs.
+
+Features
+--------
+
+* Adjustable number of minor and major ticks
+* Adjustable start and stop positions
+* Center position is marked with a dot for later drilling operations
+* Usable as an axis filter program (see below)
+* G-Code can be copied to the clipboard for easy insertion into other gcode programs
+* Use of variables for center point and Z values for easy code block reuse
+
+Screenshot
+-----------
+
+![Screenshot of bezel.py](bezel-screenshot.png)