Reolink API documentation

[Benehiko]

Thought it might be good to have a central place for the Reolink API documentation.

https://docs.google.com/document/d/1jQde_FZ2BywT8V0VQJpnPTKuV35msg9s4Nz8Xpu_usc/edit?usp=sharing

Any updated versions can also be added to this issue.

[Benehiko]

Updated version 5 (2021)

https://docs.google.com/document/d/1OmxPbSspFCST7ypS8UIlwb6qj14qw9jNxk_Ryemhdds/edit?usp=sharing