added installation section

Author: nielsdrost

_episodes/02-installation.md

@@ -0,0 +1,15 @@
+---
+title: "Installation"
+teaching: 0
+exercises: 0
+questions:
+- "Key question (FIXME)"
+objectives:
+- "First learning objective. (FIXME)"
+keypoints:
+- "First key point. Brief Answer to questions. (FIXME)"
+---
+FIXME
+
+{% include links.md %}
+