Add text to README and docs

Author: oschulz

README.md

@@ -4,3 +4,7 @@
 [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://cscherrer.github.io/DistributionMeasures.jl/dev)
 [![Build Status](https://github.com/cscherrer/DistributionMeasures.jl/actions/workflows/CI.yml/badge.svg?branch=main)](https://github.com/cscherrer/DistributionMeasures.jl/actions/workflows/CI.yml?query=branch%3Amain)
 [![Coverage](https://codecov.io/gh/cscherrer/DistributionMeasures.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/cscherrer/DistributionMeasures.jl)
+
+DistributionMeasures is a Julia package that provides conversions between
+[Distributions.jl](https://github.com/JuliaStats/Distributions.jl) distributions and
+[MeasureBase.jl](https://github.com/cscherrer/MeasureBase.jl)/[MeasureTheory.jl](https://github.com/cscherrer/MeasureTheory.jl) measures.

docs/src/index.md

@@ -6,6 +6,11 @@ CurrentModule = DistributionMeasures
 
 Documentation for [DistributionMeasures](https://github.com/cscherrer/DistributionMeasures.jl).
 
+DistributionMeasures provides conversions between
+[Distributions.jl](https://github.com/JuliaStats/Distributions.jl) distributions and
+[MeasureBase.jl](https://github.com/cscherrer/MeasureBase.jl)/[MeasureTheory.jl](https://github.com/cscherrer/MeasureTheory.jl) measures.
+
+
 ```@index
 ```