bob: Lock problem description to match current implementation

We need to be able to regenerate the exercise READMEs without
causing the README for 'bob' to drift.

A new rule has been added to the upstream problem specification,
and this hasn't yet been implemented in this track.

Author: Katrina Owen

exercises/bob/.meta/description.md

@@ -0,0 +1,10 @@
+Bob is a lackadaisical teenager. In conversation, his responses are very limited.
+
+Bob answers 'Sure.' if you ask him a question.
+
+He answers 'Whoa, chill out!' if you yell at him.
+
+He says 'Fine. Be that way!' if you address him without actually saying
+anything.
+
+He answers 'Whatever.' to anything else.