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Add 9 simple steps to use the rainfall radar model..... oh boy.

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README.md
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This is the 3rd major version of this model.
Unfortunately using this model is rather complicated and involves a large number of steps. This README (will) explain it the best I can though.
## System Requirements
- Linux (Windows *may* work but is untested. You will probably have a bad day if you use Windows)
- Node.js (a *recent* version - i.e. v16+ - the version in the default Ubuntu repositories is too old)
- Python 3.8+
- Nvidia GPU (16GiB RAM+ is **strongly recommended**) + CUDA and CuDNN (see [this table](https://www.tensorflow.org/install/source#gpu) for which versions you need)
- Experience with the command line
- 1TiB disk space free
- Lots of time and patience
## Overview
The process of using this model is as follows.
1. Apply for access to [CEDA's 1km rainfall radar dataset](https://catalogue.ceda.ac.uk/uuid/27dd6ffba67f667a18c62de5c3456350)
2. Obtain rainfall radar data (use [`nimrod-data-downloader`](https://www.npmjs.com/package/nimrod-data-downloader))
3. Obtain a heightmap (or *Digital Elevation Model*, as it's sometimes known) from the Ordnance Survey (can't remember the link, please PR to add this)
4. Use [`terrain50-cli`](https://www.npmjs.com/package/terrain50-cli) to slice the the output from steps #2 and #3 to be exactly the same size [TODO: Preprocess to extract just a single river basin from the data]
5. Push through [HAIL-CAESAR](*https://github.com/sbrl/HAIL-CAESAR) (this fork has the ability to handle streams of .asc files rather than each time step having it's own filename)
6. Use `rainfallwrangler` in this repository (finally!) to convert the output to .tfrecord files
7. Pretrain a contrastive learning model
8. Encode the rainfall radar data with the contrastive learning model you pretrained
9. Train the *actual* model to predict water depth
Only steps #6 to #9 actually use code in this repository.
## rainfallwrangler
`rainfallwrangler` is a Node.js application to wrangle the dataset into something more appropriate for training an AI efficiently. The rainfall radar and water depth data are considered temporally to be regular time steps. Here's a diagram explaining the terminology: