readme for attributes exercises

match/exercises/3_attributes/README.md

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+# Getting to Know Match - EXERCISES
+
+Used on the [Attributes Exercises](https://learning.internet2.edu/courses/96/pages/set-up-matchgrids?module_item_id=3167) of training in Canvas.
+
+Images included in this collection:
+
+| File name | Description |
+| --- | --- |
+| [Matchgrid_Records.png](https://github.internet2.edu/InCommon-Training/comanage-files/blob/master/match/exercises/1_get-to-know/Matchgrid_Records.png?raw=true) | Screenshot of Matchgrid without Records. <img src="https://github.internet2.edu/InCommon-Training/comanage-files/blob/master/match/exercises/1_get-to-know/Matchgrid_Records.png?raw=true" alt="Screenshot of Matchgrid without Records" title="Screenshot of Matchgrid without Records." /> |