Add license to Docker image README.md files (#4689)

Signed-off-by: Simon Stone <sstone1@uk.ibm.com>

Author: Simon Stone

Diff for: packages/composer-cli/docker/README.md

@@ -0,0 +1,14 @@
+# Hyperledger Composer
+
+:warning: :warning: :warning:
+
+**As of the 29th August 2019, the Hyperledger Composer project is in deprecated status. None of the maintainers are actively developing new features. None of the maintainers are actively providing support via GitHub issues. However, if you wish to submit code changes via pull requests, these will be merged.**
+
+**It is highly recommended that you use Hyperledger Fabric v1.4+ instead, which features significant improvements to the developer experience, including a new programming model.**
+
+**More information available here: [What's new in Hyperledger Fabric v1.4](https://hyperledger-fabric.readthedocs.io/en/release-1.4/whatsnew.html#improved-programming-model-for-developing-applications)**
+
+:warning: :warning: :warning:
+
+## License <a name="license"></a>
+Hyperledger Project source code files are made available under the Apache License, Version 2.0 (Apache-2.0), located in the LICENSE file. Hyperledger Project documentation files are made available under the Creative Commons Attribution 4.0 International License (CC-BY-4.0), available at http://creativecommons.org/licenses/by/4.0/.

Diff for: packages/composer-playground/docker/README.md

@@ -8,4 +8,7 @@
 
 **More information available here: [What's new in Hyperledger Fabric v1.4](https://hyperledger-fabric.readthedocs.io/en/release-1.4/whatsnew.html#improved-programming-model-for-developing-applications)**
 
-:warning: :warning: :warning:
+:warning: :warning: :warning:
+
+## License <a name="license"></a>
+Hyperledger Project source code files are made available under the Apache License, Version 2.0 (Apache-2.0), located in the LICENSE file. Hyperledger Project documentation files are made available under the Creative Commons Attribution 4.0 International License (CC-BY-4.0), available at http://creativecommons.org/licenses/by/4.0/.

Diff for: packages/composer-rest-server/docker/README.md

@@ -0,0 +1,14 @@
+# Hyperledger Composer
+
+:warning: :warning: :warning:
+
+**As of the 29th August 2019, the Hyperledger Composer project is in deprecated status. None of the maintainers are actively developing new features. None of the maintainers are actively providing support via GitHub issues. However, if you wish to submit code changes via pull requests, these will be merged.**
+
+**It is highly recommended that you use Hyperledger Fabric v1.4+ instead, which features significant improvements to the developer experience, including a new programming model.**
+
+**More information available here: [What's new in Hyperledger Fabric v1.4](https://hyperledger-fabric.readthedocs.io/en/release-1.4/whatsnew.html#improved-programming-model-for-developing-applications)**
+
+:warning: :warning: :warning:
+
+## License <a name="license"></a>
+Hyperledger Project source code files are made available under the Apache License, Version 2.0 (Apache-2.0), located in the LICENSE file. Hyperledger Project documentation files are made available under the Creative Commons Attribution 4.0 International License (CC-BY-4.0), available at http://creativecommons.org/licenses/by/4.0/.