Update README.md

Author: devvsakib

L-A/0014 Memoize II/README.md

@@ -71,3 +71,10 @@ There are different aproaches to overcome this. But since every Symbol() call is
 ## Problem Added By
 
 - [deveshidwivedi](https://github.com/deveshidwivedi)
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+## Contributing
+Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
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+Please make sure to update tests as appropriate.