content: add developers and contributing section

content/developers/_index.md

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+title = "Developers"
+description = "Developer documentation."
+date = 2022-09-13T23:30:00+00:00
+sort_by = "weight"
+weight = 1
+template = "docs/section.html"
++++

content/developers/contributing.md

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+title = "Contributing"
+description = "Contribution Guidelines."
+date = 2022-09-13T22:27:00+10:00
+template = "docs/page.html"
+sort_by = "weight"
+weight = 0
+draft = false
+[extra]
+lead = 'Our software and documentation are open for contributions - join us in developing the future!'
+toc = true
+top = false
++++
+
+## Contribution Pathways
+
+- [Blue Robotics](https://github.com/bluerobotics/software-guidelines)
+- [ArduPilot](https://ardupilot.org/dev/docs/contributing.html)
+   - [Top Contributors](https://github.com/ardupilot/ardupilot#top-contributors)
+   - [How to Get Involved](https://github.com/ardupilot/ardupilot#how-to-get-involved)
+- [QGroundControl](https://dev.qgroundcontrol.com/master/en/contribute/)
+- [MAVLink](https://mavlink.io/en/contributing/contributing.html)
+
+## This Documentation
+
+Add a new section / version via a repository/branch as a submodule
+```
+git submodule add -b <branch-name> --name <section-name> <repository url> <path/to/desired/location>
+```