docs: release 1.16 notes document

Signed-off-by: Ramon Roche <mrpollo@gmail.com>

docs/en/releases/1.16.md

@@ -0,0 +1,79 @@
+# PX4-Autopilot v1.16 Release Notes
+
+<Badge type="tip" text="Release Candidate"/>
+
+Work in Progress
+
+Please continue reading for [upgrade instructions](#upgrade-guide).
+
+## Major Changes
+
+- Work in Progress
+
+## Upgrade Guide
+
+- Work in Progress
+
+## Other changes
+
+### Hardware Support
+
+- Work in Progress
+
+### Common
+
+- Work in Progress
+
+### Control
+
+- Work in Progress
+
+### Estimation
+
+- Work in Progress
+
+### Sensors
+
+- Work in Progress
+
+### Simulation
+
+- Work in Progress
+
+### Ethernet
+
+- Work in Progress
+
+### MAVLink
+
+- Work in Progress
+
+### uXRCE-DDS Interface
+
+- Work in Progress
+
+### ROS 2
+
+- Work in Progress
+
+## Platform Changes
+
+### Multi-Rotor
+
+- Work in Progress
+
+### VTOL
+
+- Work in Progress
+
+### Fixed-Wing
+
+- Work in Progress
+
+### Rover
+
+- Work in Progress
+
+## Changelog
+
+[Full changelog available on Github here. (v1.15.0...v1.16.0)](https://github.com/PX4/PX4-Autopilot/compare/v1.15.0...v1.16.0)

docs/en/releases/index.md

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 A list of PX4 release notes, they contain a list of the changes that went into each release, explaining the included features, bug fixes, deprecations and updates in detail.
 
 - [main](../releases/main.md) (changes since v1.15)
+- [v1.16](../releases/1.16.md) (release candidate)
 - [v1.15](../releases/1.15.md)
 - [v1.14](../releases/1.14.md)
 - [v1.13](../releases/1.13.md)