Document top-level directories

Change-Id: I52889e4823cbeb841c7dc9da12b5fe4c6a79d663
Reviewed-on: https://review.monogon.dev/c/monogon/+/3310
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/go/README.md b/go/README.md
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--- /dev/null
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+# `//go`
+
+Go libraries which are not specific to any component live here. For example, this is a good place to put algorithms or helper libraries.