added a demo class

csst_proto/some_other_modules.py

@@ -14,3 +14,42 @@ def a_demo_function(*args):
     >>> a_demo_function(None)
     """
     return None
+
+
+class ADemoClass:
+    """
+    A demo class.
+
+    This class is a demo.
+    This is a second-line comment for extended summary.
+
+    Parameters
+    ----------
+    first_name : str
+        The first name.
+    last_name : str
+        The last name.
+
+    Attributes
+    ----------
+    first_name : str
+        The first name.
+    last_name : str
+        The last name.
+
+    Methods
+    -------
+    say_hello()
+        Print hello message.
+
+    Examples
+    --------
+    >>> a = ADemoClass("Jane", "Doe")
+    >>> a.say_hello()
+    """
+    def __init__(self, first_name, last_name):
+        self.first_name = first_name
+        self.last_name = last_name
+
+    def say_hello(self):
+        print("Hello, {} {}!".format(self.first_name, self.last_name))

csst_proto/top_level_interface.py

 from .flip_image import flip_image, read_test_image
-from .some_other_modules import a_demo_function
+from .some_other_modules import a_demo_function, ADemoClass
 
 
-__all__ = ["flip_image", "read_test_image", "a_demo_function"]
+__all__ = ["flip_image", "read_test_image", "a_demo_function", "ADemoClass"]