Initial commit: Python library for Markdown note services

- Add MDAuth class for authentication and session management
- Add MDClient class for note operations (CRUD + export/search)
- Add CLI tool mdclient_cli.py for quick operations
- Support for CodiMD, HedgeDoc, and HackMD services
- Multi-endpoint API compatibility

Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>

pyproject.toml

@@ -0,0 +1,58 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "mdclient"
+version = "0.1.0"
+description = "Markdown 笔记服务的 Python 客户端库"
+readme = "README.md"
+license = {text = "MIT"}
+authors = [
+    {name = "Your Name", email = "your.email@example.com"}
+]
+keywords = ["markdown", "notes", "codimd", "hedgedoc", "hackmd", "api", "client"]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+]
+requires-python = ">=3.8"
+dependencies = [
+    "requests>=2.28.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=7.0.0",
+    "black>=22.0.0",
+    "flake8>=5.0.0",
+    "mypy>=0.990",
+]
+env = [
+    "python-dotenv>=1.0.0",
+]
+
+[project.urls]
+Homepage = "https://github.com/yourusername/mdclient"
+Repository = "https://github.com/yourusername/mdclient"
+Issues = "https://github.com/yourusername/mdclient/issues"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["mdclient*"]
+
+[tool.black]
+line-length = 100
+target-version = ["py38", "py39", "py310", "py311", "py312"]
+
+[tool.mypy]
+python_version = "3.8"
+warn_return_any = true
+warn_unused_configs = true