delete outdated design file

design.md

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-# Design Document for JaxPM
-
-This document aims to detail some of the API, implementation choices, and internal mechanism.
-
-## Objective
-
-Provide a user-friendly framework for distributed Particle-Mesh N-body simulations.
-
-## Related Work
-
-This project would be the latest iteration of a number of past libraries that have provided differentiable N-body models.
-
-- [FlowPM](https://github.com/DifferentiableUniverseInitiative/flowpm): TensorFlow
-- [vmad FastPM](https://github.com/rainwoodman/vmad/blob/master/vmad/lib/fastpm.py): VMAD
-- Borg
-
-
-In addition, a number of fast N-body simulation projets exist out there:
-- [FastPM](https://github.com/fastpm/fastpm)
-- ...
-
-## Design Overview
-
-### Coding principles
-
-Following recent trends and JAX philosophy, the library should have a functional programming type of interface.
-
-
-### Illustration of API
-
-Here is a potential illustration of what the user interface could be for the simulation code:
-```python
-import jaxpm as jpm
-import jax_cosmo as jc
-
-# Instantiate differentiable cosmology object
-cosmo = jc.Planck()
-
-# Creates initial conditions
-inital_conditions = jpm.generate_ic(cosmo, boxsize, nmesh, dtype='float32')
-
-# Create a particular solver
-solver = jpm.solvers.fastpm(cosmo, B=1)
-
-# Initialize and run the simulation
-state = solver.init(initial_conditions)
-state = solver.nbody(state)
-
-# Painting the results
-density = jpm.zeros(boxsize, nmesh)
-density = jpm.paint(density, state.positions)
-```