添加开源项目治理模式调研文档

[dune0310421]

添加了治理模式调研文档，目前包含paddlepaddle，pytorch 和 apache hadoop三个项目，记录了每个项目的关键角色和职责、任命机制和决策机制

[paddle-bot[bot]]

你的PR提交成功，感谢你对开源项目的贡献! 请检查PR提交格式和内容是否完备，具体请参考示例和模版。 Your PR has been submitted. Thanks for your contribution! Please check its format and content. For this, you can refer to Template and Demo.

[dune0310421]

本pr未reviewer，关闭后重新提交

[jzhang533]

lets keep this PR open, and adding more findings as we progress.

[CLAassistant]

All committers have signed the CLA.