Implement Reader/Writer of game data

[diasssavio]

One should implement Writer & Reader classes to generate game snapshots as a closed system.

This should generate file(s) snapshotting the game system. Initially, this files may be written as plain binary files and/or json file. The writer would output the files as the game goes, while the reader will be used independently (within python library) to retrieve that information.

For general organization, I was thinking in something like that:

• A master file written as a .json, containing initial game information and general data), such as:
  • Ball
  • Cars
  • World parameters (stiffness, damping, timestep, game duration, ...)
  • Models employed (normal, tangential, ...)
• History files containing snapshots of periodic times (e.g. every 0.5s, 1s, 10s, etc). The period of snapshot will be a solver/game input parameter.

As a suggestion, for json write/handling in C++, I suggest use the library JSON for Modern C++ or Boost JSON. For history binary files, the std::fstream should do just fine.

This will primarily serve as a feeding mechanism for the visual toolkit being developed in #6.

In the future, this may become a replay saver/retriever mechanism. We may also evaluate in the future the usage of binary HDF files format.

[diasssavio]

@mrsmatos This is a good first issue, if you want to. We've briefly discussed it before. If you are interested, let me know so we can talk and I can explain you the general idea.