fix: add pyproject.toml for openenv validate

pyproject.toml

@@ -0,0 +1,28 @@
+[build-system]
+requires = ["setuptools>=68.0"]
+build-backend = "setuptools.backends.legacy:build"
+
+[project]
+name = "code-review-env"
+version = "1.0.0"
+description = "OpenEnv-compliant code review environment for AI agents"
+readme = "README.md"
+requires-python = ">=3.11"
+license = {text = "MIT"}
+keywords = ["openenv", "code-review", "reinforcement-learning", "agent"]
+dependencies = [
+    "fastapi==0.111.0",
+    "uvicorn[standard]==0.29.0",
+    "pydantic==2.7.1",
+    "openai>=1.30.0",
+    "requests>=2.31.0",
+    "pyyaml>=6.0",
+]
+
+[project.urls]
+Homepage = "https://huggingface.co/spaces/ColdHearted/CodeReviewenv"
+Repository = "https://github.com/JanaKrisnaB/CodeReviewEnv"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["tasks*", "graders*", "agents*"]