[README] Update README

Bug: 65959
Change-Id: I5994898fc0391fe6d76daa9f13d303c08381f1d8
Reviewed-on: https://fuchsia-review.googlesource.com/c/infra/roller-tests/test-project/+/468639
Reviewed-by: Oliver Newman <olivernewman@google.com>
diff --git a/README.md b/README.md
index 8b90b74..e01fafa 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
-Fuchsia Open Source Template Repository
+Roller Tests: Test Project
 =======================================
 
-This repository is a template that we will use when creating new open source
-repositories for Fuchsia.
+This repository is tracked by fuchsia/infra/roller-tests/integration.git, and is
+used to automate testing for Fuchsia rollers. Do not modify this repository.