Revert "Remove unused project."

This reverts commit eaada771a6e62ca494a625ce1b060f1a94fa9877.

Reason for revert: Breaks build_test and other builds
Bug: 155862492

Change-Id: I1a14b84d54b05596ec250b31ae56e437cf49fd81
diff --git a/files/plugin.prop b/files/plugin.prop
new file mode 100644
index 0000000..44a6a1b
--- /dev/null
+++ b/files/plugin.prop
@@ -0,0 +1,3 @@
+# begin plugin.prop
+plugin.version=23.0.0
+# end plugin.prop