renamed modules and generators to fit pep8

mathgenerator/funcs/surface_area_sphere.py

@@ -0,0 +1,16 @@
+from .__init__ import *
+
+
+def surfaceAreaSphere(maxSide=20, unit='m'):
+    r = random.randint(1, maxSide)
+
+    problem = f"Surface area of Sphere with radius = {r}{unit} is"
+    ans = 4 * math.pi * r * r
+    solution = f"{ans} {unit}^2"
+    return problem, solution
+
+
+surface_area_sphere = Generator(
+    "Surface Area of Sphere", 60,
+    "Surface area of sphere with radius = a units is", "d units^2",
+    surfaceAreaSphere)