Added basic python programs

Beginner_Level_Python_programs/compound_interest.py

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+def compound_interest(principle, rate, time): 
+
+    # Calculates compound interest  
+    Amount = principle * (pow((1 + rate / 100), time)) 
+    CI = Amount - principle 
+    print('The principal is', principle) 
+    print('The time period is', rate) 
+    print('The rate of interest is',time) 
+    print("Compound interest is", CI) 
+
+compound_interest(10000, 10.25, 5) 

Beginner_Level_Python_programs/factorial.py

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+def factorial(n):
+
+    return 1 if (n==1 or n==0) else n * factorial(n - 1)
+
+
+num=input("Please enter number to calculate factorial:")
+
+print ("Factorial of",num,"is",factorial(int(num)))

Beginner_Level_Python_programs/simple_interest.py

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+def simple_interest(principle,time,rate): 
+    print('The principal is', principle) 
+    print('The time period is', time) 
+    print('The rate of interest is',rate) 
+
+    si = (principal * time * rate)/100
+
+    print('The Simple Interest is', si) 
+    return si 
+
+
+simple_interest(8, 6, 8)