Updating rootfs README, and moving up timestamp file

Having timestamp file written before the bash shell is brought up
allows us to check it before completing the image

Change-Id: Iae18dded2ed95c4ad71b1cf977bdf9e1dd405e8d
Signed-off-by: Jim Ostrowski <yimmy13@gmail.com>
diff --git a/frc971/raspi/rootfs/make_sd.sh b/frc971/raspi/rootfs/make_sd.sh
index 81f7727..3b73a32 100755
--- a/frc971/raspi/rootfs/make_sd.sh
+++ b/frc971/raspi/rootfs/make_sd.sh
@@ -32,15 +32,15 @@
   target /root/bin/change_hostname.sh "${1}"
 fi
 
-echo "Starting a shell for any manual configuration"
-target /bin/bash --rcfile /root/.bashrc
-
 # Put a timestamp on when this card got created and by whom
 TIMESTAMP_FILE="${PARTITION}/home/pi/.DiskFlashedDate.txt"
 date > "${TIMESTAMP_FILE}"
 git rev-parse HEAD >> "${TIMESTAMP_FILE}"
 whoami >> "${TIMESTAMP_FILE}"
 
+echo "Starting a shell for any manual configuration"
+target /bin/bash --rcfile /root/.bashrc
+
 # Found I had to do a lazy force unmount ("-l" flag) to make it work reliably
 sudo umount -l "${PARTITION}"
 rmdir "${PARTITION}"