Adding TODO.

TODO.md

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+# To Do - Ideas and Project Planning
+
+## Decision Matrix Attributes
+- Aggregate School Rating
+    - Will use data from multiple endpoints
+- Proximity
+    - Develop Calculator Using Lat, Lon
+    - Distance to Work
+    - Distance to Boston
+
+## API Usage
+- [x] Wrapper for `nearby_schools` endpoint
+- [ ] Wrapper for `subratings` endpoint
+    - Leverage to get college readiness and standardized test performance
+- [ ] Wrapper for `metrics` endpoint
+    - Leverage to get enrollment, student-teacher ratio, teacher details