Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contribute to fs_extra
+## About me
+Hello everyone, my name is Denis. I'm a maintainer at the current time of this project. I begin to write when I study rust. Because the current code base has some inconvenience. When I work full time on rust in other projects I found it. But don't have free time to fix it. Many people make a request to get full access to fs_extra and I'm ready to do it. But I should make sure that the project moves into good hands. Because I planing find 3 hours per week for this project. I'm not sure I have time for programming. But this time I plan to spend on a merge PR, publish a new version, and answer issues. Maybe sometime I found time for codding. But my life very changed much after 24 February when war is begin... When my stupid government begins it. I lost my business and lеft my country because I don't support what Russians dot it right now. And this little step, what I can do. I've tried to go to the street and say I am against it, but people who follow Russia they know how it ends. Right now have a more important task in my life to survive.
+
+## Report for bugs
+We use GitHub issues for our public bugs. If you would like to report a problem, take a look around and see if someone already opened an issue about it. If you are certain this is a new unreported bug, you can submit a bug report.
+If you have questions about using fs_extra you can ask us in [Discussions](https://github.com/webdesus/fs_extra/discussions) 
+
+## Pull request
+So you have decided to contribute code back to upstream by opening a pull request. You've invested a good chunk of time, and we appreciate it. We will do our best to work with you and get the PR looked at.
+Your PR will be awesome if he follows:
+- Dependencies are optional. If you add a feature that requires installing a new library this feature should use Rust compile option for switch on. Default off. 
+Structs and methods for new features which will be using external lib should contain in  `src/features/` folder. 
+- Contains test cases if you add new features.
+## RFC
+We store RFC documents using md format in `src/rfc` folder. Using PR mechanism you can offer new ideas for our project