Solved grains in Bash

bash/grains/README.md

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+# Grains
+
+Welcome to Grains on Exercism's Bash Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.
+
+There once was a wise servant who saved the life of a prince.
+The king promised to pay whatever the servant could dream up.
+Knowing that the king loved chess, the servant told the king he would like to have grains of wheat.
+One grain on the first square of a chess board, with the number of grains doubling on each successive square.
+
+There are 64 squares on a chessboard (where square 1 has one grain, square 2 has two grains, and so on).
+
+Write code that shows:
+
+- how many grains were on a given square, and
+- the total number of grains on the chessboard
+
+## Source
+
+### Created by
+
+- @sjwarner-bp
+
+### Contributed to by
+
+- @bkhl
+- @budmc29
+- @glennj
+- @guygastineau
+- @IsaacG
+- @kotp
+- @ZapAnton
+
+### Based on
+
+The CodeRanch Cattle Drive, Assignment 6 - https://coderanch.com/wiki/718824/Grains