printdigits readme for exam

subjects/printdigitsprog.en.md

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+## printdigitsprog
+
+### Instructions
+
+Write a [program](TODO-LINK) that prints the decimal digits in ascending order (from `0` to `9`) on a single line.
+
+A line is a sequence of characters preceding the [end of line](https://en.wikipedia.org/wiki/Newline) character (`'\n'`).
+
+### Usage
+
+```console
+student@ubuntu:~/printdigitsprog$ go build
+student@ubuntu:~/printdigitsprog$ ./main
+0123456789
+student@ubuntu:~/printdigitsprog$
+```