chore: add pyproject with ruff and pytest config

pyproject.toml

@@ -0,0 +1,21 @@
+[project]
+name = "ace-music-studio"
+version = "0.1.0"
+description = "Open-source full-song generation studio wrapping ACE-Step 1.5 XL"
+authors = [{ name = "Mayank Gupta" }]
+license = { text = "MIT" }
+readme = "README.md"
+requires-python = ">=3.11,<3.12"
+
+[tool.ruff]
+line-length = 110
+target-version = "py311"
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "B", "UP", "RUF"]
+ignore = ["E501"]
+
+[tool.pytest.ini_options]
+addopts = "-m 'not gpu' --tb=short"
+markers = ["gpu: requires a real GPU/MPS device; opt in with -m gpu"]
+testpaths = ["tests"]