Upgrade-tester toolset (#110)

Signed-off-by: Dean Roehrich <dean.roehrich@hpe.com>

Author: roehrich-hpe

.gitignore

@@ -21,3 +21,8 @@ vendor/
 go.work
 
 .version
+
+# For the upgrade-tester tool.
+upgrade-tester/workingspace/
+workingspace/
+

upgrade-tester/README.md

@@ -0,0 +1,5 @@
+# Upgrade Tester
+
+The `upgrade-gitops-maker.sh` and `upgrade-tester.sh` tools are used together to execute upgrades across a series of releases. The former populates a gitops repo with the NNF releases, and the latter installs those releases.
+
+See [Upgrade Tester](https://nearnodeflash.github.io/dev/repo-guides/release-nnf-sw/upgrade-tester.md) in the NNF documentation for details.