Update List.py

documentation for better understanding.

List.py

@@ -1,14 +1,14 @@
 List = []
 # List is Muteable
 # means value can be change
-List.insert(0, 5)
-List.insert(1, 10)
+List.insert(0, 5) #insertion takes place at mentioned index
+List.insert(1, 10) 
 List.insert(0, 6)
 print(List)
-List.remove(6)
-List.append(9)
+List.remove(6) 
+List.append(9) #insertion takes place at last 
 List.append(1)
-List.sort()
+List.sort()    #arranges element in ascending order
 print(List)
 List.pop()
 List.reverse()