use cases programm improvements

usecases/README.md

 # GitLab use cases for data analysis projects
 
-- creating new project in [GitLab](https://www.gitlab.com):
-  - project namespace
-  - group and individual access levels
+- [LUMC](http://git.lumc.nl) git server (based on [GitLab](https://www.gitlab.com)) concepts:
+  - projects (equivalent to separate git repositories; private or public)
+  - members (users who have access to the projects; full, read-only, comment, etc)
+  - groups (groups of users; share access rights and namespaces)
+  - demo how to create a new project (note shell commands to connect to the repository)
 - `README.md` file:
   - editing in the browser
   - [markdown](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet) language
   - commiting changes
-  - checking commit log and graph
   - checking changes
+  - checking commit log and graph [[real example](https://git.lumc.nl/biopet/biopet/network/develop)]
   - project skeletons
 - _use case:_ writing minutes of a meeting
 - _use case:_ bioinformatics analysis: