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/build/README.md b/build/README.md
new file mode 100644
index 0000000..3514ef6
--- /dev/null
+++ b/build/README.md
@@ -0,0 +1,4 @@
+# `//build`
+
+This directory contains global build and CI infrastructure which are useful across the entire monorepo, such as toolchains, Bazel libraries and CI config.
+