Added initial version of logging.md file.#315

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mlanting wants to merge 6 commits intoros2:gh-pagesfrom

mlanting:logging_design

Commits on May 6, 2021

Added initial version of logging.md file.
mlanting
committed

Commits on May 7, 2021

Commits on May 10, 2021

Changed format of ROS2 to ROS 2
mlanting
committed

Commits on May 19, 2021

Added more detail about creating loggers and setting levels
mlanting
committed

Commits on Jun 4, 2021

Added detail to output and backend sections.
mlanting
committed