Analyzers for using UniverseLib and avoiding common mistakes when making universal Unity mods and tools.
If you are not aiming for "universal" support and you are only writing for a specific game, then this analyzer will be of less importance to you, as the fixes are generally aimed at avoiding mistakes in a universal context.
If you'd rather have the analyzer as a VSIX extension, you can build the solution and open the folder UniverseLib.Analyzers.Vsix\bin\Debug\net472\, then open the file UniverseLib.Analyzers.Vsix.vsix and install it.