add 231 and 342 to solved table

Author: Li Li

README.md

@@ -3,7 +3,7 @@
 I will use this repository to make notes for leetcode solutions and sort similar questions into the same group or category.
 
 ## Solved Problem List
-Total solved: 40
+Total solved: 42
 
 ### Algorithms Basics
 
@@ -78,6 +78,9 @@ ID | Difficulty | Tags | Solution
 136 | Easy | Bit Manipulation n | [Single Number](https://github.com/kflili/LeetcodeCShaprDotNetCore/blob/master/Algorithms%20Basics/Chapter%205.%20Bit%20Manipulation/136.%20Single%20Number.cs)
 190 | Easy | Bit Manipulation n | [Reverse Bits](https://github.com/kflili/LeetcodeCShaprDotNetCore/blob/master/Algorithms%20Basics/Chapter%205.%20Bit%20Manipulation/190.%20Reverse%20Bits.cs)
 191 | Easy | Bit Manipulation n | [Number of 1 Bits](https://github.com/kflili/LeetcodeCShaprDotNetCore/blob/master/Algorithms%20Basics/Chapter%205.%20Bit%20Manipulation/191.%20Number%20of%201%20Bits.cs)
+231 | Easy | Bit Manipulation n | [Power of Two](https://github.com/kflili/LeetcodeCShaprDotNetCore/blob/master/Algorithms%20Basics/Chapter%205.%20Bit%20Manipulation/231.%20Power%20of%20Two.cs)
+342 | Easy | Bit Manipulation n | [Power of Four](https://github.com/kflili/LeetcodeCShaprDotNetCore/blob/master/Algorithms%20Basics/Chapter%205.%20Bit%20Manipulation/342.%20Power%20of%20Four.cs)
+
 
 
 ## Other Topics