docs: README stub

README.md

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+# Modif
+
+Forgejo unfortunately doesn't support autogenerating release changelogs, and while a lot of tooling already exists out here to tackle that sort of problem, it often does far too much extra for my taste. Thus, `modif` seeks to do one thing and do it well: generate simple markdown changelogs from commit history data (and later, validate that commits comply with a desired format for those logs).
+
+## Install
+
+This isn't published anywhere, but can be installed directly from source control via `pipx` or `pip`:
+
+```sh
+# With pipx
+pipx install git+https://forge.karnov.club/marc/modif.git
+
+# With pip
+pip install git+https://forge.karnov.club/marc/modif.git
+```
+
+The repository can also be pulled down to put it together yourself.
+
+## Usage
+
+### Generating changelogs from commit ranges
+
+Changelogs can be generated based on a start and end reference:
+
+```sh
+modif log --from=<reference> --to=<reference>
+```
+
+Using the `--raw` flag will output the changelog markdown without any colours or headers - the output otherwise has
+extra messaging that isn't part of the changelog itself.
+
+### Commit format
+
+Some assumptions are made about commit message formatting that will later be made more configurable. It is expected that commits conforms to the [Conventional Commit](https://www.conventionalcommits.org/en/v1.0.0/) scheme.