WIP: Hydai/update solility 0.5.12

.circleci/README.md

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+## CircleCI integration
+
+### Docker images
+
+The docker images are build locally on the developer machine:
+
+```!sh
+cd .circleci/docker/
+
+docker build -t ethereum/solidity-buildpack-deps:ubuntu1904 -f Dockerfile.ubuntu1904 .
+docker push ethereum/solidity-buildpack-deps:ubuntu1904
+```
+
+which you can find on Dockerhub after the push at:
+
+    https://hub.docker.com/r/ethereum/solidity-buildpack-deps
+
+where the image tag reflects the target OS to build Solidity and run its test on.
+
+### Testing docker images locally
+
+```!sh
+cd solidity
+# Mounts your local solidity directory in docker container for testing
+docker run -v `pwd`:/src/solidity -ti ethereum/solidity-buildpack-deps:ubuntu1904 /bin/bash
+cd /src/solidity
+<commands_to_test_build_with_new_docker_image>
+```