Add built-in project template for Tonic research projects
## Details The [Tonic project structure][tonic-standard] has been developed for (neuro)scientific research projects by several german Collaborative Research Centers in order to improve research data management and simplify data re-use, sharing, and collaboration during the research process. Git and self-hosted git services like gitlab or gogs play a fundamental role in the main strategy, see also [GIN] as an example infrastructure. In order to make the structure more popular among researchers and easier to adopt in new projects, we'd like to add the project to gitlab's built-in templates. The project structure is [available as a git repo][template], please review it and provide feedback whether you consider it to be appropriate at this place. [tonic-standard]: https://gin-tonic.netlify.app/standard/ [GIN]: https://gin.g-node.org [template]: https://gitlab.com/tonic-team/Tonic-Research-Project-Template
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