Add gitlab pages (just the README)

.gitlab-ci.yml

+image: python:3.8-buster
+
+before_script:
+  - pip install -r requirements.txt
+
+test:
+  stage: test
+  script:
+  - mkdocs build --strict --verbose --site-dir test
+  artifacts:
+    paths:
+    - test
+  except:
+  - master
+
+pages:
+  stage: deploy
+  script:
+  - mkdocs build --strict --verbose
+  artifacts:
+    paths:
+    - public
+  only:
+  - master

docs/index.md

+# FRaMED SPL (2.0)
+
+
+The *Full-fledged Role Modeling EDitor Software Product Line* (FRaMED SPL) (Version 2.0) is the reimplementation of FRaMED allowing the graphical specification of Role-based Software Systems by means of *compartments* (aka. *contexts*), *objects*, *roles*, and *relationships*. Moreover, it supports a varity of constraints upon roles and relationships.
+
+While this was already possible in [FRaMED](https://github.com/leondart/FRaMED), this editor is a feature modular *graphical editor product line* (GEPL)¹ that permits users to dynamically reconfigure the available concepts, as well as constraints and developers to modularly extending the language family adding and removing concepts and constraints.
+
+Further information can be found in the [wiki](https://github.com/Eden-06/FRaMED-2.0/wiki).
+
+![Graphical user interface of FRaMED SPL](https://raw.githubusercontent.com/wiki/Eden-06/FRaMED-2.0/Images/framed-spl.png)
+
+¹) Thomas Kühn, Kevin Ivo Kassin, Walter Cazzola, and Uwe Aßmann, *Modular Feature-Oriented Graphical Editor Product Lines*. In Proceedings of the 22th International Software Product Line Conference, ACM, 2018.
+
+## Installation for Users
+
+1. Install a Java 8 runtime environment
+2. Download and run the appropriate build for your system:
+    - Windows: [64 bit zip](https://git-st.inf.tu-dresden.de/rosi/framed/-/raw/master/build/win32.win32.x86_64.zip)
+    - Linux: [64 bit zip](https://git-st.inf.tu-dresden.de/rosi/framed/-/raw/master/build/linux.gtk.x86_64.zip)
+    - Mac OS: [64 bit zip](https://git-st.inf.tu-dresden.de/rosi/framed/-/raw/master/build/macosx.cocoa.x86_64.zip)
+
+## Installation for Developers
+
+Please follow the [instructions on Github](https://github.com/Eden-06/FRaMED-2.0/wiki/Install).
\ No newline at end of file

mkdocs.yml

+site_name: FRAmED
+site_url: https://pages.gitlab.io/mkdocs
+site_dir: public
+theme: readthedocs