Add a description on how the content of this repository is updated
diff --git a/README b/README
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+This repository contains the history of a single file, the bazel
+distribution archive. Distribution archives are generated by
+
+ bazel build //:bazel-distfile
+
+on a checkout of the respective bazel version. The bazel sources are
+available at https://github.com/bazelbuild/bazel. Distribution archives
+are also generated for each release (under the name bazel-<version>-dist.zip).
+Usually, updates are only done for releases by simply copying the
+distribution archive of the release to bazel-distfile.zip in this
+repository.
