Added readme

setup.py

@@ -9,7 +9,7 @@ def read_requirements():
 setup(
     name="charged_shells",
     version="0.1.0",
-    description="Permeable charged chell model code.",
+    description="Permeable charged shell model code.",
     packages=find_packages(),
     install_requires=read_requirements(),
     python_requires='>=3.10',