Improved the script file

setup.py

@@ -1,20 +1,29 @@
 import os
-import pkg_resources
 from setuptools import setup, find_packages
+import pkg_resources
 
+# Path to the requirements file
+requirements_path = os.path.join(os.path.dirname(__file__), "requirements.txt")
+
+# Read the requirements from the requirements file
+if os.path.exists(requirements_path):
+    with open(requirements_path, 'r') as f:
+        install_requires = [str(r) for r in pkg_resources.parse_requirements(f)]
+else:
+    install_requires = []
 
 setup(
     name="diffsynth",
-    py_modules=["diffsynth"],
     version="1.0.0",
-    description="",
+    description="A library for differential synthesis.",
     author="Artiprocher",
     packages=find_packages(),
-    install_requires=[
-        str(r)
-        for r in pkg_resources.parse_requirements(
-            open(os.path.join(os.path.dirname(__file__), "requirements.txt"))
-        )
+    install_requires=install_requires,
+    include_package_data=True,
+    classifiers=[
+        "Programming Language :: Python :: 3",
+        "License :: OSI Approved :: MIT License",
+        "Operating System :: OS Independent",
     ],
-    include_package_data=True
+    python_requires='>=3.6',
 )