believer 0.2.1

A toolbox to simulate error correcting code performance.
Documentation
# Notes for believer project

## Erasure decoding pipeline
- [x] Implement decoder
- [x] Implement simulation tools

## Random codes generation
- [ ] Implement hierarchical codes
- [ ] Implement decreasing prob codes

## General
- [x] Implement Decoder trait for BP
- [ ] Do a real readme
- [x] Add the number of bits in parity check matrix constructor.

## Ideas
- [ ] Implement hypergraph product
- [ ] Implement generalized bicycle product

## Cleaning
- [ ] Sparse matrix
- [x] BP decoder
- [ ] Erasure decoder
- [ ] Simulator

## Documenting
- [ ] Sparse matrix
- [ ] BP decoder
- [ ] Lib
- [ ] Erasure decoder
- [ ] Simulator
- [ ] Decoder trait

## Testing
- [ ] Sparse matrix
- [x] BP decoder
- [ ] General
- [ ] Simulator