Create CONTRIBUTING.md

Author: EkaterinaVu

CONTRIBUTING.md

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+# How to contribute
+
+## Before creating an issue
+
+* Check the [GUIDE](https://www.ditdot.hr/en/docs/vue-flow-form-guide) to see if you can find the solution to your problem by yourself.
+* Check the version of Vue Flow Form you are using - use the last version according to CHANGELOG.
+* Perform the [Issues](https://github.com/ditdot-dev/vue-flow-form/issues) search to see if the problem has already been reported.
+* If the issue has been reported and is still open, add a comment to it instead of opening a new issue.
+* If the issue has been reported and is closed, open a new issue with a link to the closed issue.
+* If the issue hasn't been reported, open a new issue.
+
+## Creating a bug report
+
+* Use a descriptive title and describe the exact steps to reproduce the problem.
+* Explain what kind of behavior you expected and why.
+* Share as much information about the problem as you can - include screenshots, GIFs, reports, etc.
+
+## Suggesting an enhancement
+
+* Use a descriptive title and describe the feature request/change in details
+* Explain why this enhancement would be useful
+
+## Creating a pull request
+
+* Make your changes on a feature branch. Follow the code style of the project, including indentation.
+* Create a new PR with the code changes
+* The PR description should clearly describe the problem and solution, with a reference to the appropriate issue if applicable
+
+