Added function to read persisted sudoku

data/README.md

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+## How to download sudokus
+
+
+https://sudoku-api.vercel.app/api/dosuku is a sudoku generator.  Hitting twice
+the api returns two different sudokus.
+
+The below command is will download a soduko and persist it to the
+`sudoku_099.json` file.
+
+````shell
+ curl https://sudoku-api.vercel.app/api/dosuku -o sudoku_099.json
+``````