Added a basic calculator program

Calculator/calculator.py

@@ -0,0 +1,35 @@
+# Add function
+def add(x,y):
+    return x + y
+
+#Subtract function
+def subtract(x,y):
+    return x - y
+
+#Multiply Function
+def multiply(x, y):
+    return x * y
+
+#Divide Function
+def divide(x,y):
+    return x / y
+
+#Main Function
+def main():
+    print("Welcome to the Basic Calculator!")
+    x = int(input("Enter an integer: "))
+    y = int(input("Enter another integer: "))
+
+    computation = input("Do you want to Add, Multiply, Subtract, or Divide the numbers?: ")
+
+
+    if computation.lower() == "add":
+        print(add(x,y))
+    elif computation.lower() == "multiply":
+        print(multiply(x,y))
+    elif computation.lower() == "divide":
+        print(divide(x,y))
+    else:
+        print(subtract(x,y))
+
+main()