upgrade-apply-deltafs: Add a README file

Change-Id: I1d76ad615a9f40b4de87f9b1940eb57611337b00

diff --git a/src/upgrade-apply-deltafs/README.md b/src/upgrade-apply-deltafs/README.md
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+# upgrade-apply-deltafs
+
+## Run with script
+
+This tool can be run using scripts provided with the delta with following steps:
+
+1. Make sure your delta is located in `/opt/usr/data/fota`
+
+2. Extract `upgrade-trigger.sh` from delta and place it in the same directory
+
+3. Run `./upgrade-trigger.sh [path_to_delta]`
+
+## Run with upgrade-manager
+
+N.B. This tool does not currently work with `update-manager` or other services.
+If you want it to work elevate privileges of `update-manager` (or other service),
+as DELTA_FS type update needs to be able to change file capabilities to fully work.
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