docs: Add readme for canyoucount subject #1258

subjects/canyoucount/README.md

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+## canyoucount
+
+### Instructions
+
+Your program will receive some arguments. Count how many characters they have in total and print them.
+
+### Usage
+
+```console
+$ go run . "hello" "how are you?" | cat -e
+17 $
+```