[submodule] Add rollable test-project submodule

This is intended to be used for testing the submodule roller.

Bug: 100269
Change-Id: I3c06af37cb07b30262babdfabf025f882073433e
Reviewed-on: https://fuchsia-review.googlesource.com/c/infra/roller-tests/integration/+/679307
Reviewed-by: Oliver Newman <olivernewman@google.com>
Commit-Queue: Anthony Fandrianto <atyfto@google.com>
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..11dd1b0
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "test-project"]
+	path = test-project
+	url = https://fuchsia.googlesource.com/infra/roller-tests/test-project
diff --git a/test-project b/test-project
new file mode 160000
index 0000000..2c1cfea
--- /dev/null
+++ b/test-project
@@ -0,0 +1 @@
+Subproject commit 2c1cfea4919e2fe6f150584890a7847c0569af9f