Merge pull request #36 from mrc-ide/update-readme

Extra README info

Author: thomrawson

README.md

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+This software package accompanies the manuscript "A mathematical model of H5N1 influenza transmission in US dairy cattle" (Rawson et al., 2025).
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+The package provides a flexible interface for building SEIR meta-population models of infectious disease dynamics, which we primarily use for modelling HPAI H5N1 in US dairy cattle, as seen in our associated vignettes.
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+The underlying model code can be found at [`inst/dust/cows.cpp`].
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+Fitting the model, as seen in our vignettes, can make use of traditional MCMC or particle MCMC methods via the `dust2` and `monty` packages.
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 ## Installation
 
 To install `cowflu`: