update to get failure mode

initial-kv/README.md

@@ -72,7 +72,8 @@ The full list of commands which your KV store should support are:
 - *get*: The format is `g,key`, where `key` is an integer. If the key
 is present, the system should print out the key, followed by a comma,
 followed by the value, followed by a newline (`\n`). If not present,
-nothing is printed.
+print an error message on a line by itself, of the form `K not found`
+where `K` is the actual value of the key, i.e., some integer. 
 - *delete*: The format is `d,key`, which either deletes the relevant
 key-value pair (and prints nothing), or fails to do so (and prints
 `K not found` where `K` is the actual value of the key, i.e., some