package version metadata for external/

This will be used for automated notification of external vulnerability
reports.

Change-Id: I03336587a05c456271ddd9352e3f716be5c59a4f
diff --git a/README.version b/README.version
new file mode 100644
index 0000000..e6210f8
--- /dev/null
+++ b/README.version
@@ -0,0 +1,2 @@
+URL: https://github.com/zxing/zxing
+BugComponent: 24950