Improve the pyproject.yaml file

Prompted by !113

pyproject.toml

 [project]
 name = "mat2"
 version = "0.13.4"
+description = "mat2 is a metadata removal tool, supporting a wide range of commonly used file formats, written in python3: at its core, it's a library, used by an eponymous command-line interface, as well as several file manager extensions."
 readme = "README.md"
+license = {file = "LICENSE"}
 requires-python = ">=3.9"
+dependencies = [
+        'mutagen',
+        'PyGObject',
+        'pycairo',
+]
+[project.urls]
+Repository = "https://0xacab.org/jvoisin/mat2"
+Issues = "https://0xacab.org/jvoisin/mat2/-/issues"
+Changelog = "https://0xacab.org/jvoisin/mat2/-/blob/master/CHANGELOG.md"
 
 [tool.ruff]
 target-version = "py39"