[docs ]Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contribution guide
+
+You are welcome to become a contributor for this project.
+
+Steps you should go through:
+1) Open an issue or a discussion on github
+2) Explain your case or problem that you want to solve, and offer your solution if you have it.
+   Clearly indicate that you are ready to submit a pull request (PR).
+3) Disscuss the solution with the maintainer, util it is clear for both how it should work.
+   You will get explicit confirmation that you can start working on the solution.
+   This is neccessary to minimise the risk to make changes that would be rejected
+4) Implement the solution, following project codestyle
+5) Cover new functionality with tests
+6) Add code sample and update docs with new functionality
+7) Submit a PR on github
+8) Pass code review process
+9) Your PR will be merged by the maintainer
+10) The changes will be available in next release version
+
+That is all, thank you for your contribution.