readme

Author: sbromberger

README.md

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 [![Build Status](https://travis-ci.org/sbromberger/StaticGraphs.jl.svg?branch=master)](https://travis-ci.org/sbromberger/StaticGraphs.jl)
 
 [![codecov.io](http://codecov.io/github/sbromberger/StaticGraphs.jl/coverage.svg?branch=master)](http://codecov.io/github/sbromberger/StaticGraphs.jl?branch=master)
+
+Memory-efficient, performant graph structures optimized for large networks. 
+Uses [LightGraphs](https://github.com/JuliaGraphs/LightGraphs.jl).
+
+Note: adding/removing edges and vertices is not supported with this graph type.