Setup frontend project configuration

Related issues

Closes #1 (closed)

Acceptance criteria

• Implemented code changes don't diverge from the related issue.
• Version number is incremented according to SemVer. (Snapshot versions are not merged/released.)
• Only released versions of dependencies are used (i.e. no snapshot versions).
• Pipeline still works.
• GitLab issue is up-to-date.

If necessary, the following sections have been updated:

• Readme.md

Proposed squash commit message

Add frontend configuration and setup

• Enable CI pipeline in /.gitlab-ci.yml and define each ci pipeline step in /angular-frontend/.gitlab-ci.yml
• Add eslint and eslint base configuration
• Add angular-oauth2-oidc dependency for oAuth
• Add karma configuration
• Add Dockerfile with two stage build including nginx webserver
• Add a nginx base configuratiion
• Add eslint-plugin-license-header to set license-header to each ts file via ng lint --fix
• Add license-plugin for generating third-party-licenses overview
• Add eCMR favicon to asset directory
• Add environment files
• Add third-party-licenses overview
• Update Readme.md with project information and a short description