update README.md to include Docker and not needing external source for xenial
-rw-r--r-- 1923 .clang-format
-rw-r--r-- 58 .dockerignore
-rw-r--r-- 177 .gitignore
-rw-r--r-- 146 .travis.yml
-rw-r--r-- 1883 CMakeLists.txt
-rw-r--r-- 552 Dockerfile
-rw-r--r-- 624 README.md
drwxr-xr-x - docker-build-scripts
drwxr-xr-x - docs
drwxr-xr-x - src
drwxr-xr-x - test-files