Installing

There are two types of add-ins that you can install.
Production Ready - These can be centrally deployed
Developer Add-ins - These are for testing

Developer Add-in - Using the Registry

HKCU\Software\Microsoft\Office \ 16.0 \ WEF \ Developer 

add a Reg_SZ with the folder path of the manifest file
Name = unique-GUID

HKCU\Software\Microsoft\Office \ 16.0 \ WEF \ Developer \ "addin GUID" \ UseDirectDebugger 
HKCU\Software\Microsoft\Office \ 16.0 \ WEF \ Developer \ "addin GUID" \ UseLiveReload 
HKCU\Software\Microsoft\Office \ 16.0 \ WEF \ Developer \ "addin GUID" \ UseWebDebugger 

UseDirectDebugger - Reg_DWORD = 1
UseLiveReload = Reg_DWORD = 0
UseWebDebugger = Reg_DWORD = 0

UseRuntimeLogging

HKCU\Software\Microsoft\Office \ 16.0 \ WEF \ Developer \ "addin GUID" \ RuntimeLogging 

add the (Default) value to your C:\Temp\LogFile.txt"