added readme images for u012B glyphs

Author: chrissimpkins

glyphs/u012B-slab/README.md

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+<img src="https://user-images.githubusercontent.com/4249591/32757740-fbab6754-c8ae-11e7-95dd-e780caa96318.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32757743-fe61945a-c8ae-11e7-953c-ac5ec6efdd50.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32757744-009f0c02-c8af-11e7-9ba2-76fb1fc24308.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32757745-032fbaac-c8af-11e7-85a3-f54eb813c7d1.png" height="60">