add readme for u0131-slab

Author: chrissimpkins

glyphs/u0131-slab/README.md

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+<img src="https://user-images.githubusercontent.com/4249591/32996029-4a12d238-cd4b-11e7-8b49-08b61de4f62d.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32996031-4bc7af7c-cd4b-11e7-921c-69e56c0598a6.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32996032-4dd63db0-cd4b-11e7-8189-9d6dbf12f40e.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32996035-4fd4febc-cd4b-11e7-88fb-4a641f4e156c.png" height="60">
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