New SPDX license headers have been added to `group.license` and `passwd.license` found within the `support-files` directory. These headers show that the files are licensed under the MIT license and copyrighted by Winni Neessen.
Introduced Dockerfile to manage the build process for the project, including its dependencies. This development will standardize the environment, thus making it easier for others to build and run the app. Also added necessary 'passwd' and 'group' files in 'support-files' directory for managing user details in Docker.