add 34 2

Readme.md

@@ -10,7 +10,7 @@
 
 [35. Search Insert Position](https://gitlab.eecs.umich.edu/anqiwa/myleetcodesolu/-/tree/master/Binary%20Search/35.%20Search%20Insert%20Position) (E-)
 
-[34. Find First and Last Position of Element in Sorted Array]()
+[34. Find First and Last Position of Element in Sorted Array](https://gitlab.eecs.umich.edu/anqiwa/myleetcodesolu/-/tree/master/Binary%20Search/34.%20Find%20First%20and%20Last%20Position%20of%20Element%20in%20Sorted%20Array)
 
 [1060. Missing Element in Sorted Array]()