Merge branch '8-roadmap' into 'master'

Resolve "Add Roadmap"

Closes #8

See merge request hifis/hifis.net!25

roadmap/index.md

+---
+title: Roadmap
+layout: roadmap
+excerpt:
+  "The is the roadmap of the HIFIS platform. 
+   It summarises the goals for the next months and years."
+---
+{% comment %}
+  This markdown file triggers the generation of the roadmap page.
+  Only the frontmatter is required by Jekyll.
+  The contents section does not get rendered into HTML on purpose.
+{% endcomment %}