added readme for u00EC-slab

Author: chrissimpkins

glyphs/u00EC-slab/README.md

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+<img src="https://user-images.githubusercontent.com/4249591/32996356-9f8794ac-cd4f-11e7-9e13-cc27b14219cd.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32996357-a16ce2ae-cd4f-11e7-9a0f-7978f60ccb42.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32996359-a32071ce-cd4f-11e7-8a51-9416e0c82476.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32996361-a5010076-cd4f-11e7-8688-5d375f2148c7.png" height="60">