Update README.md

Author: jakhax

README.md

@@ -1,5 +1,7 @@
 # Docker Mbed Cli
 
+>> Mbed Os now has an official docker image, see [https://github.com/ARMmbed/mbed-os/pkgs/container/mbed-os-env](https://github.com/ARMmbed/mbed-os/pkgs/container/mbed-os-env)
+
 This is an un-official  [mbed-cli](https://os.mbed.com/docs/mbed-os/v5.12/tools/developing-mbed-cli.html) docker image. Currently it only supports `GCC Arm` as its default compiler.
 
 ## Building
@@ -58,4 +60,4 @@ For more usage see [https://os.mbed.com/docs/mbed-os/v6.2/build-tools/mbed-cli.h
 
 - https://os.mbed.com/docs/mbed-os/v6.2/build-tools/install-and-set-up.html
 - https://vsupalov.com/docker-shared-permissions/
-- https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads
+- https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads