package version metadata for external/

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Change-Id: I5dc17cdb308ae0b0b14729725c6d937dfa197afc
diff --git a/README.version b/README.version
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index 0000000..e33d22d
--- /dev/null
+++ b/README.version
@@ -0,0 +1,3 @@
+URL: https://github.com/NanoHttpd/nanohttpd/archive/Release-2.1.0.tar.gz
+Version: 2.1.0
+BugComponent: 31808