Add a README to the Doc folder #27

doc/readme.md

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+# doc/
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+This folder contains Jupyter Notebooks exploring data output and processing the data. There are the following notebooks:
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+- [`API_exploration.ipynb`](API_exploration.ipynb): explores the output from the API, while creating a skeleton of the Python code that would eventually become the API scraper.
+- [`Single_station_all_day_analysis.ipynb`](Single_station_all_day_analysis.ipynb): Single station data analysis for single day of historic data.
+- [`filtering_observed_arrivals.ipynb`](filtering_observed_arrivals.ipynb): Documenting progress on [Generate Stop Arrival Times #13](https://github.com/CivicTechTO/ttc_subway_times/issues/13).
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+For the Data Dictionary, check out [`DataDictionary.md`](DataDictionary.md)