Update README to point to TF project.

Bug: 169073154
Change-Id: I0acec1decf79af3296ce1a8f702483b8c83a4c95
diff --git a/README.md b/README.md
index 5ee74bf..3a9d6f7 100644
--- a/README.md
+++ b/README.md
@@ -2,27 +2,13 @@
 
 Hafnium is a hypervisor, initially supporting aarch64 (64-bit Armv8 CPUs).
 
-Get in touch and keep up-to-date at
-[hafnium-discuss@googlegroups.com](https://groups.google.com/forum/#!forum/hafnium-discuss).
+Development is no longer hosted here, as it has been donated to the
+[Trusted Firmware](https://www.trustedfirmware.org/) project hosted by Linaro.
+Please see the new
+[git repository](https://review.trustedfirmware.org/plugins/gitiles/hafnium/hafnium),
+[project page](https://www.trustedfirmware.org/projects/hafnium/) and
+[bug dashboard](https://developer.trustedfirmware.org/project/21/item/view/67/)
+instead.
 
-## Getting started
-
-To jump in and build Hafnium, follow the
-[getting started](docs/GettingStarted.md) instructions.
-
-If you want to contribute to the project, see details of
-[how we accept contributions](CONTRIBUTING.md).
-
-## Documentation
-
-More documentation is available on:
-
-*   [Hafnium architecture](docs/Architecture.md)
-*   [Code structure](docs/CodeStructure.md)
-*   [Hafnium test infrastructure](docs/Testing.md)
-*   [Running Hafnium under the Arm Fixed Virtual Platform](docs/FVP.md)
-*   [How to build a RAM disk containing VMs for Hafnium to run](docs/HafniumRamDisk.md)
-*   [Building Hafnium hermetically with Docker](docs/HermeticBuild.md)
-*   [The interface Hafnium provides to VMs](docs/VmInterface.md)
-*   [Scheduler VM expectations](docs/SchedulerExpectations.md)
-*   [Hafnium coding style](docs/StyleGuide.md)
+This repository is kept for historical reference, but no new changes will be
+accepted here.