package version metadata for external/

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Change-Id: I0b0de54315e535035739e6900d2808b439a8b802
diff --git a/README.version b/README.version
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--- /dev/null
+++ b/README.version
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+URL: http://ceres-solver.org/ceres-solver-1.10.0.tar.gz
+Version: 1.10.0
+BugComponent: 43059