added readme for U+012F

Author: chrissimpkins

glyphs/u012F-slab/README.md

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+<img src="https://user-images.githubusercontent.com/4249591/32805456-7dbdca2c-c957-11e7-9c32-d5465e7969d9.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32805461-800e40b8-c957-11e7-8620-f3ebb5f02299.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32805462-823d23b8-c957-11e7-86db-97f37d1ec762.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32805467-844e6f18-c957-11e7-9d74-b986a3d7cc28.png" height="60">
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