package version metadata for external/

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Change-Id: I9aabbe75a1a06d0ec3421ac5e78c786a22e27325
diff --git a/README.version b/README.version
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index 0000000..65fd217
--- /dev/null
+++ b/README.version
@@ -0,0 +1,3 @@
+URL: http://sourceforge.net/projects/proguard/files/proguard/5.1/proguard5.1.tar.gz/download
+Version: 5.1
+BugComponent: 99142