armstrong numbers

rust/armstrong-numbers/README.md

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+# Armstrong Numbers
+
+Welcome to Armstrong Numbers on Exercism's Rust Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+An [Armstrong number][armstrong-number] is a number that is the sum of its own digits each raised to the power of the number of digits.
+
+For example:
+
+- 9 is an Armstrong number, because `9 = 9^1 = 9`
+- 10 is _not_ an Armstrong number, because `10 != 1^2 + 0^2 = 1`
+- 153 is an Armstrong number, because: `153 = 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153`
+- 154 is _not_ an Armstrong number, because: `154 != 1^3 + 5^3 + 4^3 = 1 + 125 + 64 = 190`
+
+Write some code to determine whether a number is an Armstrong number.
+
+[armstrong-number]: https://en.wikipedia.org/wiki/Narcissistic_number
+
+## Source
+
+### Created by
+
+- @shingtaklam1324
+
+### Contributed to by
+
+- @AndrewKvalheim
+- @coriolinus
+- @cwhakes
+- @eddyp
+- @efx
+- @ErikSchierboom
+- @lutostag
+- @ocstl
+- @petertseng
+- @rofrol
+- @sputnick1124
+- @stringparser
+- @xakon
+- @ZapAnton
+
+### Based on
+
+Wikipedia - https://en.wikipedia.org/wiki/Narcissistic_number