README: add a build badge (status of the VSTS build)

Just like so many other OSS projects, we now also have a build badge. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
gitgitgadget · Sep 3, 2018 · dc1d890 · dc1d890
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diff --git a/README.md b/README.md
@@ -1,3 +1,5 @@
+[![Build Status](https://git.visualstudio.com/git/_apis/build/status/test-git.git)](https://git.visualstudio.com/git/_build/latest?definitionId=2)
+
 Git - fast, scalable, distributed revision control system
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