Allow installing via pip

Author: bbhtt

README.md

@@ -13,8 +13,11 @@ This can,
 
 Install `git`.
 
-Symlink `git-evtag` to `~/.local/bin/git-evtag` or somewhere else that
-is in `$PATH`. Then,
+Install `git_evtag_py`
+
+```sh
+pip install --user git+https://github.com/bbhtt/[email protected]#egg=git_evtag_py
+```
 
 ```sh
 # Show the EVTag checksum of HEAD

pyproject.toml

@@ -10,6 +10,13 @@ readme = "README.md"
 requires-python = "<4.0,>=3.10"
 dependencies = []
 
+[build-system]
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
+
+[project.scripts]
+git-evtag = "git_evtag_py:main"
+
 [project.urls]
 Homepage = "https://github.com/bbhtt/git-evtag-py"
 Repository = "https://github.com/bbhtt/git-evtag-py.git"