Readme update (#68)

* readme update

* update Contributing part

* imp

* Update README.md

* Update README.md

* imp

* rm,link

fix #58

README.md

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 # Coluna.jl
 
 [![Documentation](https://img.shields.io/badge/docs-latest-blue.svg)](https://atoptima.github.io/Coluna.jl/latest)
 [![Build Status](https://travis-ci.org/atoptima/Coluna.jl.svg?branch=master)](https://travis-ci.org/atoptima/Coluna.jl)
 [![codecov](https://codecov.io/gh/atoptima/Coluna.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/atoptima/Coluna.jl)
 [![Join the chat at https://gitter.im/Coluna-dev/community](https://badges.gitter.im/Coluna-dev/community.svg)](https://gitter.im/Coluna-dev/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Project Status: WIP – Initial development is in progress, but there has not yet been a stable, usable release suitable for the public](https://www.repostatus.org/badges/latest/wip.svg)](https://www.repostatus.org/#wip)
+[![License: MPL 2.0](https://img.shields.io/badge/License-MPL%202.0-brightgreen.svg)](https://opensource.org/licenses/MPL-2.0)
+
+
+`Coluna` is a branch-and-price-and-cut framework that decomposes and solves 
+a mixed-integer program (MIP). The user introduces his "original" problem formulation using the [`JuMP`](https://github.com/JuliaOpt/JuMP.jl) modeling language and our specific extension
+[`BlockDecomposition`](https://github.com/atoptima/BlockDecomposition.jl). 
+
+`Coluna` reformulates the user problem based on the "annotations" provided along side the original formulation using `BlockDecomposition`.
+
+`Coluna` aims to be very modular and tweakable so that any user can define the behavior of his customized branch-and-price-and-cut algorithm. The user can create its own algorithmic strategy using the algorithmic building blocks offered in `Coluna`.
+
+## Installation
+
+You can install Coluna.jl through the package manager of Julia. 
+Go to the Pkg-REPL-mode using the key `]` from the Julia REPL. 
+Then, run the following command :
+
+```
+   pkg> add https://github.com/atoptima/Coluna.jl.git
+```
+
+## Features
+
+We aim to integrate to Coluna the state-of-the-art techniques used for 
+branch-and-cut-and-price algorithms.
+
+As functionality goes, we aim to provide the support for:
+
+- [x] Dantzig-Wolfe decomposition 
+- [ ] Benders decomposition
+- [ ] Mixed Dantzig-Benders decomposition
+- [ ] Nested/Recursive decomposition
+- [x] Column generation
+- [ ] Cuts generation
+- [x] Branch-and-price-and-cut customization
+- [ ] Ad-hoc customised oracles for solving subproblems / separation routines
+- [ ] Preprocessing specific to reformulated problems / cleaning up of large scale formulations 
+- [ ] stabilisation and other convergence speed-up methods
+- [ ] Strong-branching 
+- [ ] Parallelisation of the Branch-and-Bound Tree Search 
+
+## Authors
+
+The current main contributors to Coluna.jl are:
+
+- François Vanderbeck
+- Guillaume Marques
+- Vitor Nesello
+- Teobaldo Bulhões
+
+## Sponsor
+
+The plateform development has received an important support grant from the international scientific society [**Mathematical Optimization Society' (MOS)**](http://www.mathopt.org/)
+
+## Contributing
+
+- Choose an issue and open a PR with a proposition to fix it.
+- Open new issues if you find a bug or a way to enhance the package.