PetaPoco has coding standards and guidelines.

We use the Framework Design Guidelines and all code should try and follow these guidelines.
All public APIs should include XML doc comments. See XML Documentation Comments (C# Programming Guide)
All bug fixes should include a unit test(s).
All features must include a unit test(s) and an integration test(s).

Contributing to PetaPoco

There are a number of ways you can contribute to the PetaPoco project:

Identifying issues - report them.
Identifying defects - Report as an issue, then PR (to development) a failing unit test(s).
Fixing defects - Report as an issue, then PR (to development) a fix and supporting unit test(s).
Implementing features - Report as an issue, wait for the community to agree, then PR (to development) the feature and supporting unit test(s) and integration test(s). If you don't get the go-ahead for a feature, please don't be offended if your PR is not pulled.