added readme for u00EE-slab

Author: chrissimpkins

glyphs/u00EE-slab/README.md

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+<img src="https://user-images.githubusercontent.com/4249591/32996282-be289a38-cd4e-11e7-8189-63047025fb3a.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32996283-c0419aea-cd4e-11e7-89d3-62770ee6ba2a.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32996286-c2469a8e-cd4e-11e7-980a-e060f2443ca6.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32996288-c426570e-cd4e-11e7-833b-762a6d89fa83.png" height="60">