How should I set up a development environment for making add-ins for ArcGIS 10.3? There is no walk-thru anywhere that I can find for this. First, ESRI says Visual Studio 2013 is supported but in other places people say it is not. Also here they walk-thru fixes for the MSBuild targets which is a problem I am encountering because I am updating an Add-In but can't even find the targets to rename after installing the SDK.
Furthermore, where is the best link to the SDK to download for 10.3.x development? There is no help here with with what version of the SDK to download as I would expect. What is the order in which the SDK and the best version of Microsoft VS needs to be installed in? I reverted to VS 2010 and removed and re-installed the SDK ArcGIS Runtime for .NET 10.2.6 from the developers.arcgis.com site and there are no targets in my Program Files (x86)/MSbuild/ directory as apparently there should be.
In summary, what is a step-by-step walkthru for developing Add-Ins for ArcGIS 10.3+ with .NET and Visual Studio (any version)?