Feature doc

[yoannkubera]

Designed the markdown documentation.
Also identified issues related to the execution.

Additions

• CHANGELOG.md and CONTRIBUTING.md files, doc/ dir
• Markdown preview script 'doc/preview.py'
• Written a base Readme.md file as well as base usage information

What's missing

• The contents of the LICENSE file ;
• In the Readme.md file :
  • Replace the "TODO" text by the name of the license in the corresponding badge ;
  • Replace the "TODO" text by the required version of c++ in the corresponding badge ;
  • Replace the "TODO: General description of the project" text by the actual description of the project ;
  • ? Include an acknowledgement related to LGI2A / Artois university in the "Acknowledgements" section ?
  • Check that the command line to run the example is apporpriate (./build/main -i data/CVRP/toy.vrp) ;
  • Fill in the supported versions for gcc / g++ and CMake
• Replace logo.svg by a better logo
• In the doc/options.md file :
  • Write the content of the file
• In the doc/usage.md file :
  • Check the validity of the information in the "Presentation" section ;
  • Fill in the documentation for the "Instances", "Reader" and "Problem" sections.
• A new file doc/solver.md in the documentation, telling when and how to create a solver, and how to test it
• Inclusion of a link towards that documentation file in the readme.

Issues

The actual command running the solver could not be assessed because the compilation failed on the target system.
See the issue 3 for more information.