feat(792-binary-search): add py3 solution

0792_binary-search/python3/solution.py

@@ -0,0 +1,16 @@
+class Solution:
+    def search(self, nums: List[int], target: int) -> int:
+        start = 0
+        end = len(nums) - 1
+        
+        while start <= end:
+            mid = (start + end) // 2
+            
+            if nums[mid] == target:
+                return mid
+            elif target < nums[mid]:
+                end = mid - 1
+            else:
+                start = mid + 1
+        
+        return -1