Pyproject: added description and classifiers [ci skip]

Description in particular is important since it is shown in pypi

pyproject.toml

@@ -5,13 +5,16 @@ requires = ["hatchling"]
 [project]
 name = "serena-agent"
 version = "1.1.1"
-description = ""
+description = "A powerful MCP toolkit for coding, providing semantic retrieval and editing capabilities - the IDE for your agent"
 authors = [{ name = "Oraios AI", email = "info@oraios-ai.de" }]
 readme = "README.md"
 requires-python = ">=3.11, <3.15"
 classifiers = [
   "License :: OSI Approved :: MIT License",
   "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.13",
 ]
 dependencies = [
   "requests==2.33.0",