update to docs

docs/index.md

@@ -1,3 +1,11 @@
 # Quaffing
 
-Questionaire analysis using Fisher information non-parametric embedding.
+Questionaire analysis using Fisher information non-parametric embedding.
+
+## Purpose
+`quafing` provides tools to visually analyse high-dimensional data for structure making use of information theory. 
+In particular `quafing` has been designed to support the analysis of questionaire data.
+
+## Use of Quafing
+A basic overview of the use of `quafing` is provided below. Please also consult the example notebooks provided [link],
+as well as as the API documentation.