Update doc index.md to link to github page (#825)

docs/src/index.md

@@ -6,7 +6,7 @@ CurrentModule = PowerModels
 
 ## Overview
 
-PowerModels.jl is a Julia/JuMP package for Steady-State Power Network Optimization. It provides utilities for parsing and modifying network data (see [PowerModels Network Data Format](@ref) for details), and is designed to enable computational evaluation of emerging power network formulations and algorithms in a common platform.
+[PowerModels.jl](https://github.com/lanl-ansi/PowerModels.jl) is a Julia/JuMP package for Steady-State Power Network Optimization. It provides utilities for parsing and modifying network data (see [PowerModels Network Data Format](@ref) for details), and is designed to enable computational evaluation of emerging power network formulations and algorithms in a common platform.
 
 The code is engineered to decouple [Problem Specifications](@ref) (e.g. Power Flow, Optimal Power Flow, ...) from the [Formulation Details](@ref) (e.g. AC, DC approximation, SOC relaxation, ...). This enables the definition of a wide variety of power network formulations and their comparison on common problem specifications.