Update README.md

Author: Tr0sT

README.md

@@ -13,3 +13,21 @@ The library depends on [Odin Inspector](https://odininspector.com/)
 
 ## Documentation
 - [Документация](https://github.com/NuclearBand/UnityScriptableObjectDatabase/blob/master/Packages/com.nuclearband.sodatabase/Documentation/Documentation.ru.md)
+
+## Contributing
+
+### Issues
+
+Issues are very valuable to this project.
+
+- Ideas are a valuable source of contributions others can make
+- Problems show where this project is lacking
+- With a question you show where contributors can improve the user experience
+
+### Pull Requests
+
+Pull requests are, a great way to get your ideas into this repository.  
+
+## License
+
+* MIT