Added new python exercise with solution (#346)

* added new python exercise and solution

* add sort exercise and solutions

* changed heading1

* fixed header description

topics/python/solutions/class_0x00_solution.md

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+## Class 0x00 - Solution
+
+1. write a simple class that has two attributes of which one has a default value and has two methods
+
+```python
+from typing import Optional
+""" Student Module
+
+    """
+
+
+class Student:
+    def __init__(self, name: str, department: Optional[str] = None) -> None:
+        """ Instance Initialization function
+
+        Args:
+            name (str): Name of student
+            department (Optional[str], optional): Department. Defaults to None.
+        """
+        self.name = name
+        self.department = department
+
+    def getdetails(self) -> str:
+        """ Gets the students details
+
+        Returns:
+            str: A formatted string
+        """
+        return f"Name is {self.name}, I'm in department {self.department}"
+
+    def change_department(self, new_deparment: str) -> None:
+        """Changes the department of the student object
+
+        Args:
+            new_deparment (str): Assigns the new deparment value to dept attr
+        """
+        self.department = new_deparment
+
+# student1 instantiation
+student1 = Student("Ayobami", "Statistics")
+
+print(student1.getdetails())
+
+# Calling the change_department function to change the department of student
+student1.change_department("CS")
+
+print(student1.department)
+```
+
+Output
+
+```
+Name is Ayobami, I'm in department Statistics
+CS
+```