Update README
Add "Nightly builds" section and status badge.
[![GoDoc](https://godoc.org/github.com/containerd/containerd?status.svg)](https://godoc.org/github.com/containerd/containerd)
[![Build Status](https://travis-ci.org/containerd/containerd.svg?branch=master)](https://travis-ci.org/containerd/containerd)
[![Windows Build Status](https://ci.appveyor.com/api/projects/status/github/containerd/containerd?branch=master&svg=true)](https://ci.appveyor.com/project/mlaventure/containerd-3g73f?branch=master)
+![](https://github.com/containerd/containerd/workflows/Nightly/badge.svg)
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@@ -24,6 +25,12 @@ See how to build containerd from source at [BUILDING](BUILDING.md).
If you are interested in trying out containerd see our example at [Getting Started](docs/getting-started.md).
+## Nightly builds
+
+There are nightly builds available for download [here](https://github.com/containerd/containerd/actions?query=workflow%3ANightly).
+Binaries are generated from `master` branch every night for `Linux` and `Windows`.
+
+Please be aware: nightly builds might have critical bugs, it's not recommended for use in prodution and no support provided.
## Runtime Requirements
