Added documentation and information to the programs

homework06/git-practice/sphere1.py

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+# Program sphere1.py
+
+startUpMessage = '''
+This program calculates the volume of a sphere. 
+
+'''
+
+print(startUpMessage)
+
+
+import math
+PI = math.pi
+
+radius = float(input("Enter the radius of a sphere "))
+
+
+volume = 4 / 3 * PI  * radius**3
+
+print(f"The volume of the sphere is {volume:.2f}")