Add file 'README.delete-user'.

README.delete-user

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+# ---
+# Delete User
+# ---
+
+# see: https://docs.mattermost.com/manage/command-line-tools.html#mattermost-user-delete
+
+
+# There are two levels in user deactivation/deletion:
+#
+# The first one is user deactivation which is what you performed. After deactivating a user, 
+# that user becomes archived and you can still search him/her and read their messages in 
+# channels.
+#
+# The second is user deletion. You can do this via a CLI command. Note that when you permanently 
+# delete a user, all their posts and past activities will get permanently deleted.
+
+
+# Permanently delete a user and all related information, including posts from the database.
+#
+#    mattermost user delete <users>
+#
+# Note:
+#    Does not delete content from the file storage. You can manually delete all file uploads 
+#    for a given user as uploads contain the CreatorId field. User profile pictures are stored 
+#    in data/users/<userid>/profile.png.
+