Add data files

Author: s2t2

docs/data/README.md

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+# Datasets
+
+## Colab
+
+Files in "colab/sample_data" directory were downloaded from Google Colab.
+
+## Nasdaq
+
+File: "nasdaq_screener_1735923271750.csv"
+
+Accessed from https://www.nasdaq.com/market-activity/stocks/screener on 1/3/2025 using the "Download CSV" button.
+
+## AlphaVantage
+
+Files:
+
+  + "currency_daily_btc_usd_20241123.csv" accessed using digital currency daily endpoint
+  + "daily_adjusted_nflx" accessed using the stock daily adjusted endpoint
+  + "treasury_yield_*.csv" accessed using treasury yield endpoint
+
+## Generated
+
+  + "monthly_sales.csv" was generated programmatically by the author