feat: Initializes project with basic configuration and structure

- Creates `cliff.toml` for changelog generation.
- Adds `pyproject.toml` for project metadata and dependencies.
- Sets up initial file structure with `.gitkeep`.

src/patchman/.gitkeep

@@ -0,0 +1,22 @@
+<!-- This checklist outlines the rough plan for the "patchman" tool. It focuses on core functionality and will evolve over time. -->
+
+# Patchman Feature Checklist (Initial Planning)
+
+- [ ] Apply patches in order (like `quilt push`)
+- [ ] Revert applied patches (like `quilt pop`)
+- [ ] Track current patch level
+- [ ] Edit the currently active patch
+- [ ] Generate a new patch from:
+  - [ ] specific files
+  - [ ] all staged changes
+  - [ ] all unstaged changes
+- [ ] Configure upstream source (branch or remote)
+- [ ] Fetch and reset to upstream (optionally via config)
+- [ ] Use a project-local config file (e.g. `patchman.yaml`)
+- [ ] Derive patch series order from numbered filenames (no `series` file required)
+- [ ] Optional reverse-apply (`git revert` or patch reverse)
+- [ ] Integrate with Git (using CLI directly, not a lib)
+- [ ] Provide CLI via `typer` with autocompletion
+- [ ] Build a Textual-based TUI frontend (after CLI is stable)
+- [ ] Handle malformed or outdated patch files gracefully
+- [ ] Support dry-run mode (for testing without modification)