implement basic app structure, add mockup GUI

pyproject.toml

@@ -0,0 +1,37 @@
+[project]
+name = "factum"
+version = "0.0.0"
+description = "Forensic note-taking application which utilizes PGP signatures on timestamped notes to ensure maximum integrity."
+authors = [
+    {name = "Mario Stöckl", email = "mstoeck3@hs-mittweida.de"}
+]
+readme = "README.md"
+requires-python = "==3.13.*"
+license = {text = "BSD-3-Clause"}
+
+dependencies = [
+    "PySide6~=6.8.0",
+    "logging>=0.4.9.6",
+    "openai~=2.8.1",
+    "python-dotenv~=1.2.1",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/factum"]
+
+[tool.uv.workspace]
+members = [
+    "factum",
+]
+
+[project.scripts]
+factum = "factum.main:main"