added README with images for u0069-slab glyphs by @dok42

Author: chrissimpkins

glyphs/u0069-slab/README.md

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+<img src="https://user-images.githubusercontent.com/4249591/32582506-2d1b2bc6-c4bd-11e7-8cb7-8dbe6c4fc13b.png" height="60">
+
+<img src="https://user-images.githubusercontent.com/4249591/32582507-30e71ba2-c4bd-11e7-8f99-b740e7cd0bbd.png" height="60">
+
+<img src="https://user-images.githubusercontent.com/4249591/32582514-35851e20-c4bd-11e7-8678-b83284454806.png" height="60">
+
+<img src="https://user-images.githubusercontent.com/4249591/32582516-3aecbbac-c4bd-11e7-8b1d-7c2c11c5b886.png" height="60">