added code for sort-uniq-head-tail script 7 exercise

Author: Luke-Manyamazi

shell-pipelines/sort-uniq-head-tail/script-07.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 # TODO: Write a command to show how many times anyone has entered and exited.
 # It should be clear from your script's output that there have been 5 Entry events and 4 Exit events.
 # The word "Event" should not appear in your script's output.
+grep -c "Entry" events-with-timestamps.txt
+grep -c "Exit" events-with-timestamps.txt