Copy "Working on this repo" section from nextstrain/ingest

Copied the section from the nextstrain/ingest README

¹ <https://github.com/nextstrain/ingest/blob/258ab8ce898a88089bc88caee336f8d683a0e79a/README.md?plain=1#L128C1-L148C36>

README.md

@@ -13,4 +13,26 @@ and workflow organization that is expected of a Nextstrain maintained pathogen.
 However, the workflows will require customizations to support your specific pathogen
 and should not be expected to "just work".
 
+## Working on this repo
+
+This repo is configured to use [pre-commit](https://pre-commit.com),
+to help automatically catch common coding errors and syntax issues
+with changes before they are committed to the repo.
+
+If you will be writing new code or otherwise working within this repo,
+please do the following to get started:
+
+1. [install `pre-commit`](https://pre-commit.com/#install) by running
+   either `python -m pip install pre-commit` or `brew install
+   pre-commit`, depending on your preferred package management
+   solution
+2. install the local git hooks by running `pre-commit install` from
+   the root of the repo
+3. when problems are detected, correct them in your local working tree
+   before committing them.
+
+Note that these pre-commit checks are also run in a GitHub Action when
+changes are pushed to GitHub, so correcting issues locally will
+prevent extra cycles of correction.
+
 [Creating a pathogen repository]: https://docs.nextstrain.org/en/latest/tutorials/creating-a-pathogen-repo/index.html