Update entrypoint.sh

Author: wo1f1ow

entrypoint.sh

@@ -1,5 +1,6 @@
 #!/bin/bash
-
+# Docker entrypoint is a Dockerfile directive or 
+# instruction that is used to specify the executable which should run when a container is started from a Docker image.
 chmod +x /app/wait-for-it.sh
 
-/bin/bash /app/wait-for-it.sh $MYSQL_HOST:$MYSQL_PORT -t 300 -- npm start
+/bin/bash /app/wait-for-it.sh $MYSQL_HOST:$MYSQL_PORT -t 300 -- npm start