counter: add explanation and issue to deprecated file (#600)

petertseng · ErikSchierboom · commit 30d83b77f612 · 2017-02-17T09:08:36.000+01:00
Original deprecation in #407, for #383 and #80. Trend of adding replacement and issue added in #532.
diff --git a/exercises/counter/.deprecated b/exercises/counter/.deprecated
@@ -1 +1,3 @@
 **NOTE: This exercise has been deprecated.**
+It was decided that Exercism should focus on exercises with provided test suites, rather than the reverse ("write the test suite").
+https://github.com/exercism/x-common/issues/80

Original file line number	Diff line number	Diff line change
`@@ -1 +1,3 @@`
`1`	`1`	`NOTE: This exercise has been deprecated.`
	`2`	`+It was decided that Exercism should focus on exercises with provided test suites, rather than the reverse ("write the test suite").`
	`3`	`+https://github.com/exercism/x-common/issues/80`