Prepare release notes for v1.6.0-beta.0

Signed-off-by: Derek McGowan <derek@mcg.dev>

releases/v1.6.0-beta.toml

@@ -0,0 +1,50 @@
+# commit to be tagged for new release
+commit = "HEAD"
+
+project_name = "containerd"
+github_repo = "containerd/containerd"
+match_deps = "^github.com/(containerd/[a-zA-Z0-9-]+)$"
+
+# previous release
+previous = "v1.5.0"
+
+pre_release = false
+
+preface = """\
+The seventh major release of containerd includes many improvements and added
+support to increase overall compatibility and stability.
+
+### Highlights
+
+#### Runtime
+
+* **Add runtime label to metrics** [#5744](https://github.com/containerd/containerd/pull/5744)
+* **Cleanup task delete logic in v2 shim** [#5813](https://github.com/containerd/containerd/pull/5813)
+* **Add support for shim plugins** [#5817](https://github.com/containerd/containerd/pull/5817)
+* **Add runc shim support for core scheduling** [#6011](https://github.com/containerd/containerd/pull/6011)
+* **Update shim client connect attempt to fail fast when shim errors** [#6031](https://github.com/containerd/containerd/pull/6031)
+
+#### Windows
+
+* **Add support for Windows HostProcess containers** [#5131](https://github.com/containerd/containerd/pull/5131)
+
+#### CRI
+
+* **Add CNI configuration based on runtime class** [#4695](https://github.com/containerd/containerd/pull/4695)
+* **Add support for CRI v1 and v1alpha in parallel** [#5619](https://github.com/containerd/containerd/pull/5619)
+* **Add support for unified resources field for cgroups v2** [#5627](https://github.com/containerd/containerd/pull/5627)
+* **Add IP preference configuration for reporting pod IP** [#5964](https://github.com/containerd/containerd/pull/5964)
+
+#### Other
+
+* **Add a shared namespace label for cross-namespace content sharing** [#5043](https://github.com/containerd/containerd/pull/5043)
+* **Add support for client TLS Auth for grpc** [#5606](https://github.com/containerd/containerd/pull/5606)
+* **Add xfs support for devicemapper snapshotter** [#5610](https://github.com/containerd/containerd/pull/5610)
+* **Add metric exposing build version and revision** [#5965](https://github.com/containerd/containerd/pull/5965)
+
+#### Client
+
+* **Allow WithServices to use custom implementations** [#5709](https://github.com/containerd/containerd/pull/5709)
+* **Support custom compressor for walking differ** [#5735](https://github.com/containerd/containerd/pull/5735)
+
+See the changelog for complete list of changes"""