grains is easy

rust/grains/README.md

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+# Grains
+
+Welcome to Grains on Exercism's Rust Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Introduction
+
+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 chessboard, with the number of grains doubling on each successive square.
+
+## Instructions
+
+Calculate the number of grains of wheat on a chessboard.
+
+A chessboard has 64 squares.
+Square 1 has one grain, square 2 has two grains, square 3 has four grains, and so on, doubling each time.
+
+Write code that calculates:
+
+- the number of grains on a given square
+- the total number of grains on the chessboard
+
+## Source
+
+### Created by
+
+- @IanWhitney
+
+### Contributed to by
+
+- @ClashTheBunny
+- @coriolinus
+- @cwhakes
+- @efx
+- @ErikSchierboom
+- @krodyrobi
+- @lutostag
+- @navossoc
+- @nfiles
+- @petertseng
+- @rofrol
+- @stringparser
+- @TheDarkula
+- @xakon
+- @ZapAnton
+
+### Based on
+
+The CodeRanch Cattle Drive, Assignment 6 - https://web.archive.org/web/20240908084142/https://coderanch.com/wiki/718824/Grains