Initial version of packaging

This is only support "code", the real code has not been migrated yet.
Also, the README is quite lacking in content.

README.md

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+A simple tool for visualising OSPF network topology as seen by BIRD
+====
+
+<!-- TODO: write more… -->

birdvisu/__init__.py

@@ -1,3 +1,5 @@
 from pathlib import Path
 
 assets = Path(__file__).resolve().parent / 'assets'
+
+__version__ = '0.0.1-a1.dev1'

pyproject.toml

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+[project]
+name = 'birdvisu'
+description = 'A simple tool for visualising OSPF network topology as seen by BIRD'
+dynamic = ['version']
+readme = './README.md'
+requires-python = '~= 3.10'
+dependencies = [
+	'PySide6',
+]
+
+[build-system]
+requires = ["flit_core >=3.2,<4"]
+build-backend = "flit_core.buildapi"
+
+[project.optional-dependencies]
+# Just a PoC as of now, but we will (hopefully) use these tools in the future.
+doc = [
+	'sphinx',
+	]
+check = [
+	'mypy'
+	]