Add Contributor guide with the release and versioning guidelines

Add contributing guidelines, versioning, and release process.

Author: oleg-nenashev

docs/CONTRIBUTING.md

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+# Contributing
+
+Contributions are welcome!
+Just submit a pull request.
+
+## Versioning
+
+Starting from `v.1.0.0`, [semantic versioning](including metadata) is followed, including pre-release versions.
+
+## Releasing
+
+Releases are automated on GitHub Actions.
+Once the release is published on GitHub Releases,
+the GitHub actions workflow will automatically build the artifacts and uodate the `go.dev metadata
+
+For release changelogs, this repository uses Release Drafter to generated the initial draft based on the PR titles and labels.