fix: add pyproject.toml for proper package metadata

- Add pyproject.toml with all required metadata fields (Name, Version)
- Update MANIFEST.in to include CHANGELOG.md and pyproject.toml
- Fixes InvalidDistribution error when publishing to PyPI
- Uses modern Python packaging standards with PEP 621

Author: zyhe16

MANIFEST.in

@@ -1,9 +1,11 @@
 # Include the license and readme
 include LICENSE
 include README.md
+include CHANGELOG.md
 
 # Include requirements
 include requirements.txt
+include pyproject.toml
 
 # Include test configuration
 include pytest.ini

pyproject.toml

@@ -0,0 +1,40 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "personaflow"
+version = "0.1.3"
+description = "A lightweight Python library for managing dynamic multi-persona interactions with LLMs."
+readme = "README.md"
+requires-python = ">=3.12"
+license = {text = "MIT"}
+authors = [
+    {name = "Zhiyong (Justin) He", email = "justin.he814@gmail.com"}
+]
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: Developers",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "Topic :: Scientific/Engineering :: Artificial Intelligence",
+]
+dependencies = [
+    "torch",
+    "transformers>=4.45.0",
+    "accelerate",
+    "typing-extensions",
+]
+
+[project.urls]
+Homepage = "https://github.com/Ate329/PersonaFlow"
+Repository = "https://github.com/Ate329/PersonaFlow"
+Issues = "https://github.com/Ate329/PersonaFlow/issues"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["personaflow*"]
+exclude = ["tests*"]
+