Added modules.py for listing the modules in math

Author: OmkarPathak

pygorithm/math/modules.py

@@ -0,0 +1,15 @@
+import pkgutil
+
+
+def modules():
+    """
+    Find all functions in pygorithm.data_structures
+    """
+    import pygorithm.math
+    package = pygorithm.math
+    modules = []
+    for importer, modname, ispkg in pkgutil.iter_modules(package.__path__):
+        modules.append(modname)
+    modules.remove('modules')
+    modules.sort()
+    return modules