Update project info for first publish

pyproject.toml

 [tool.poetry]
 name = "hippocampus"
 version = "0.1.0"
-description = "simple memoization with sqlite3"
+description = "simple memoization with sqlite3 and expiry"
 authors = ["Pascal Jürgens <juergens@uni-trier.de>"]
 readme = "README.md"
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+]
+
 
 [tool.poetry.dependencies]
 python = "^3.11"