Auto generated docs

[andrii-bodnar]

As a Crowdin Ruby API client user, I would like to have online docs to navigate and explore the client resources, methods, parameters, etc.

Examples:

• Crowdin API Client PHP docs
• Crowdin API Client JS docs
• Crowdin API Client .NET docs

These docs should be generated using GH Actions and deployed to GH Pages. Workflow example: docs.yml

The possible tool for that is rdoc.

Steps:

• [ ] Explore tools to generate docs from code, and choose the best one.
• [ ] Create a config and provide a command to generate the docs.
• [ ] If needed, add additional annotations to the API Client code (ignore some unneeded methods in docs, add some method or parameter descriptions, etc).
• [ ] Set up the GH workflow. @andrii-bodnar can help with that.
• [ ] Set up the GH pages feature for the repo. @andrii-bodnar