Solution to reverse string in Bash

bash/reverse-string/README.md

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+# Reverse String
+
+Welcome to Reverse String on Exercism's Bash Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Reverse a string
+
+For example:
+input: "cool"
+output: "looc"
+
+## Source
+
+### Created by
+
+- @sjwarner-bp
+
+### Contributed to by
+
+- @bkhl
+- @budmc29
+- @glennj
+- @guygastineau
+- @IsaacG
+- @kotp
+- @ZapAnton
+
+### Based on
+
+Introductory challenge to reverse an input string - https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb