feat: add initial songbox API client library

This commit introduces the initial version of the songbox API client library, including:
- Core client implementation with authentication and HTTP handling
- Modular sub-clients for auth, user, and music operations
- Comprehensive exception hierarchy for error handling
- CLI interface with support for all API operations
- Setup configuration with dependencies and package metadata
- Documentation including README with usage examples

setup.py

@@ -0,0 +1,58 @@
+"""Setup script for songbox API Client Library"""
+
+from setuptools import setup, find_packages
+
+with open("README.md", "r", encoding="utf-8") as fh:
+    long_description = fh.read()
+
+with open("requirements.txt", "r", encoding="utf-8") as fh:
+    requirements = [line.strip() for line in fh if line.strip() and not line.startswith("#")]
+
+setup(
+    name="songbox",
+    version="1.0.0",
+    author="CustomIcon",
+    author_email="custom.icon@vk.com",
+    description="A Python client library for a music streaming API",
+    long_description=long_description,
+    long_description_content_type="text/markdown",
+    url="https://git.cubable.date/CustomIcon/songbox",
+    packages=find_packages(),
+    classifiers=[
+        "Development Status :: 4 - Beta",
+        "Intended Audience :: Developers",
+        "License :: OSI Approved :: MIT License",
+        "Operating System :: OS Independent",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
+        "Topic :: Software Development :: Libraries :: Python Modules",
+        "Topic :: Multimedia :: Sound/Audio",
+        "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
+    ],
+    python_requires=">=3.7",
+    install_requires=requirements,
+    extras_require={
+        "dev": [
+            "pytest>=6.0",
+            "pytest-asyncio",
+            "black",
+            "flake8",
+            "mypy",
+        ],
+    },
+    entry_points={
+        "console_scripts": [
+            "songbox=songbox.__main__:main",
+        ],
+    },
+    keywords="songbox music api client streaming maldives",
+    project_urls={
+        "Bug Reports": "https://github.com/yourusername/songbox/issues",
+        "Source": "https://github.com/yourusername/songbox",
+        "Documentation": "https://github.com/yourusername/songbox#readme",
+    },
+)