Add Installation and Contributing sections (#63)

Author: guilhermebodin

README.md

@@ -10,21 +10,4 @@
 [codecov-img]: https://codecov.io/gh/LAMPSPUC/GAS.jl/coverage.svg?branch=master
 [codecov-url]: https://codecov.io/gh/LAMPSPUC/GAS.jl?branch=master
 
-GAS.jl is a Julia package for modeling, forecasting and simulating time series with score-driven models, also known as dynamic conditional score models (DCS) or generalized autoregressive score models (GAS). Implementations are based on the paper [Generalized Autoregressive Models with Applications](http://dx.doi.org/10.1002/jae.1279) by D. Creal, S. J. Koopman and A. Lucas.
-
-# Features
-* Autoregressive structure
-* Maximum likelihood estimation
-* Monte Carlo simulation
-* General link/unlink interface
-* Available distributions:
-  * Normal
-  * Lognormal
-  * Poisson
-  * Beta
-  * Gamma
-
-# Roadmap
-* Weibull distribution
-* Student's t distribution
-* Dynamic components structure
+GAS.jl is a Julia package for modeling, forecasting and simulating time series with score-driven models, also known as dynamic conditional score models (DCS) or generalized autoregressive score models (GAS). Implementations are based on the paper [Generalized Autoregressive Models with Applications](http://dx.doi.org/10.1002/jae.1279) by D. Creal, S. J. Koopman and A. Lucas.

docs/src/index.md

@@ -2,17 +2,15 @@
 
 GAS.jl is a Julia package for modeling, forecasting and simulating time series with or generalized autoregressive score models (GAS) models, also known as dynamic conditional score models (DCS). Implementations are based on the paper [Generalized Autoregressive Models with Applications](http://dx.doi.org/10.1002/jae.1279) by D. Creal, S. J. Koopman and A. Lucas.
 
-# Features
-* SARIMA structure
-* Maximum likelihood estimation
-* Monte Carlo simulation
-* Several available distributions:
-  * Normal
-  * Lognormal
-  * Poisson
-  * Beta
-  * Gamma
+## Installation
 
-# Roadmap
-* Weibull distribution
-* Unobserved components structure
+This package is not yet registered so you can `Pkg.add` it as follows:
+```julia
+pkg> add https://github.com/LAMPSPUC/GAS.jl.git
+```
+
+## Contributing
+
+Contributions to this package are more than welcome, if you find a bug or have any suggestions for the documentation please post it on the [github issue tracker](https://github.com/LAMPSPUC/GAS.jl/issues).
+
+When contributing please note that the package follows the [JuMP style guide](https://www.juliaopt.org/JuMP.jl/stable/style/).