Add a readme file with instructions

tools/scripts/ig-hotfix/README.md

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+# Hotfix for Instance Groups and Roles after backup/restore corruption #
+
+## role_check.py ##
+
+`awx-manage shell < role_check.py 2> role_check.log > fix.py`
+
+This checks the roles and resources on the system, and constructs a
+fix.py file that will change the linkages of the roles that it finds
+are incorrect. The command line above also redirects logging output to
+a file. The fix.py file (and the log file) can then be examined (and
+potentially modified) before performing the actual fix.
+
+`awx-manage shell < fix.py > fix.log 2>&1`
+
+This performs the fix, while redirecting all output to another log
+file. Ideally, this file should wind up being empty after execution
+completes.
+
+`awx-manage shell < role_check.py 2> role_check2.log > fix2.py`
+
+Re-run the check script in order to see that there are no remaining
+problems. Ideally the log file will only consist of the equal-sign
+lines.
+
+
+## foreignkeys.sql ##
+
+This script uses Postgres internals to determine all of the foreign
+keys that cross the boundaries established by our (old) backup/restore
+logic.  Users have no need to run this.
+
+
+## scenarios/test*.py ##
+
+These files were used to set up corruption similar to that caused by
+faulty backup/restore, for testing purposes.  Do not use.