added readme for U+012D-slab glyphs

Author: chrissimpkins

glyphs/u012D-slab/README.md

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+<img src="https://user-images.githubusercontent.com/4249591/32804351-c5e3daba-c954-11e7-893b-20bae76dbf99.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32804353-c7ff6346-c954-11e7-96a1-932b6b344e92.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32804354-ca6183d0-c954-11e7-991a-41c3ea49d792.png" height="60">
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+<img src="https://user-images.githubusercontent.com/4249591/32804357-cc5481a6-c954-11e7-8a75-29dab0a0f69a.png" height="60">
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