CI: Move pre-commit readme to top level readme.

README.md

@@ -16,4 +16,20 @@ The E-SOH service consist of three parts.
       - The records api will serve all metadata for each timeseries available in E-SOH.
 
 ## Usage
-All three parts of the service is kept in this repository and can be built and setup using docker-compose. For more documentation on each part of the service see README.md in each relevant folder in this repository.
+All three parts of the service is kept in this repository and can be built and setup using docker-compose. For more documentation on each part of the service see README.md in each relevant folder in this repository.
+
+## Pre-commit
+
+### Setup
+
+1. Go to the root of the repository.
+2. Install the python pre-commit package with `pip install pre-commit`.
+3. Reinitialize the repository with `git init`.
+4. Install the hooks defined in `.pre-commit-config.yaml` with `pre-commit install`.
+
+### Useful Commands
+
+- To update the pre-commit hooks in `.pre-commit-config.yaml`, run `pre-commit autoupdate`
+- To apply the pre-commit for every file in the repository, run `pre-commit run --config './.pre-commit-config.yaml' --all-files`
+- To see all options to `pre-commit run`, run `pre-commit help run` (in particular, the `--files` option can be used to apply the command to selected files only).
+- To commit without the pre-commit hook, run `git commit -m "Some message" --no-verify`