Added solution for the Best Time to Buy and Sell Stock problem

Signed-off-by: Krishna Kishore Shetty <kkshetty.work@pm.me>

Author: Krishna Kishore Shetty

best_time_to_buy_and_sell_stock/Solution.py

@@ -0,0 +1,14 @@
+class Solution:
+    def maxProfit(self, prices: List[int]) -> int:
+        max_profit = 0
+        buy_price = 999999999
+
+        for price in prices:
+            if price<buy_price:
+                buy_price=price
+                continue
+            
+            if price>buy_price:
+                max_profit = max(max_profit, price-buy_price)
+        
+        return max_profit