package version metadata for external/

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

Change-Id: Ied4eedb2b04dd235f8ab48059e86725ec0277c67
diff --git a/README.version b/README.version
new file mode 100644
index 0000000..a345b2a
--- /dev/null
+++ b/README.version
@@ -0,0 +1,3 @@
+URL: http://www.tcpdump.org/release/tcpdump-4.5.1.tar.gz
+Version: 4.5.1
+BugComponent: 119452