Add Solving Problems section to README.md

Author: miohana

README.md

@@ -4,7 +4,7 @@
 
 :running: :hourglass: List of daily challenges for developers
 
-## Front-End
+## Front-End :computer:
 
  - [JavaScript30](https://javascript30.com/)
  - [100dayscss](https://100dayscss.com/)
@@ -14,6 +14,11 @@
  - [30 Days, 30 Sites](http://www.subscribepage.com/30days30sites)
  - [Just Build Websites](https://github.com/melanierichards/just-build-websites)
 
+## Solving Problems :dart:
+ 
+ - [URI Online Judge](https://www.urionlinejudge.com.br/)
+ - [Hackerrank](https://www.hackerrank.com/)
+ 
 
 ### How to Share
 - [Share on Twitter](http://twitter.com/home?status=https://github.com/AlexsandroSA/daily-programming-challenges)