Added example services links

Author: fspv

README.md

@@ -155,6 +155,12 @@ The output will look like this:
 So it is clearly visible which topics we should focus on in our preparation.
 In this case memoization topic is one of the targets for improvement, so I can go to https://leetcode.com/tag/memoization/ and choose a new memoization problem. Or use python to automate the process.
 
+## Example services using this library
+
+* Anki cards generator [https://github.com/prius/leetcode-anki](https://github.com/prius/leetcode-anki)
+* Leetcode helper website [https://github.com/prius/grind-helper](https://github.com/prius/grind-helper)
+
+## Additional info
 You can find other examples of usage in `example.py`
 
 Autogenerated by swagger documentation can be found [here](/README.generated.md).