README on how to proceed with encoding

[mmikhasenko]

from earlier emails.

As a result of the encoding, we will produce a file similar to
https://github.com/RUB-EP1/amplitude-serialization/blob/main/models/x2pipipi-compass-1391643.json

Tips on how we proceed:

1. Identify a git repository where we can exchange notes and code, use issue tracker that is very convenient.

https://github.com/RUB-EP1/amplitude-serialization/issues
Would be ok, but it’s public, I guess we want something in a private domain.
Either your repository where you can add me, or I create a private one and share.

2. I’d start with a single point, single bin,

• fix a point in a phase space, report 4 vectors,
• compute the amplitude (or an intensity) for the default model for this phase space point.

To match it, we need

• all sub channel resonances and their parametrization, here is an example
  https://github.com/RUB-EP1/amplitude-serialization/blob/main/models/x2pipipi-compass-1391643.json#L976-L1002

• all normalization factors, and couplings.
  It’s best to do it based on analysis note, where all conventions and normalization are written anyway.

• for debuting, it will be helpful to have the code that can be executed + running instructions in README.md

• implementation of the resonance line shape is useful to check independently, so we need a way to run the program to print / write down the complex value of the line shape for the selected phase space point.