Outline project specs and code base requirements

We can use [this document](https://hackmd.io/@AhmedAlSunbati/B1hebNVMge/edit) as a starting point.

Core tasks:
- [x] Describe major functionality requirements and modules
- [x] Outline project structure and core functions
- [ ] Construct API
- [ ] Brainstorm unit tests (how can we know for certain that our code is behaving as expected)?
- [ ] Outline plan for implementing the core functionality
- [ ] Figure out a way to store the data (on the cluster, dropbox, locally?) depending on the dataset size
- [ ] Look at [Dart Brains](https://dartbrains.org/content/Preprocessing.html) for preprocessing info/tutorials

Raw fMRI dataset is [here](https://openneuro.org/datasets/ds001745/versions/1.0.0)

Experiment events + behavioral data may be found [here](https://github.com/ContextLab/directed-forgetting-network-dynamics/tree/master/data/regressors)