Add playground.

ncfausti · Apr 9, 2018 · 0052337 · 0052337
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diff --git a/src/playground/README.md b/src/playground/README.md
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+# Playground
+
+You may use `playground.js` file to play with data
+structures and algorithms. The code from `playground.js` may
+be tested in `./__test__/playground.test.js` file.