Add more clear descriptions to SL usage by nugetizer

Author: kzu

src/CodeAnalysis/SponsorLinker.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Collections.Immutable;
+using System.Linq;
 using Devlooped;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Diagnostics;
@@ -8,14 +10,29 @@ namespace NuGetizer;
 [DiagnosticAnalyzer(LanguageNames.CSharp, LanguageNames.VisualBasic, LanguageNames.FSharp)]
 class SponsorLinker : SponsorLink
 {
-    public SponsorLinker() : base(SponsorLinkSettings.Create(
-        "devlooped", "NuGetizer",
-        version: new Version(ThisAssembly.Info.Version).ToString(3),
-        // Add an extra digit so the SL diagnostics have the same length as ours
-        diagnosticsIdPrefix: "NG1"
+    static readonly SponsorLinkSettings settings;
+
+    static SponsorLinker()
+    {
+        settings = SponsorLinkSettings.Create(
+                "devlooped", "NuGetizer",
+                version: new Version(ThisAssembly.Info.Version).ToString(3),
+                // Add an extra digit so the SL diagnostics have the same length as ours
+                diagnosticsIdPrefix: "NG1"
 #if DEBUG
-        , quietDays: 0
+                , quietDays: 0
 #endif
-        ))
-    { }
+                );
+
+        settings.SupportedDiagnostics = settings.SupportedDiagnostics
+            .Select(x => x.IsKind(DiagnosticKind.AppNotInstalled) ?
+                x.With(description: "Your package users will NOT have a dependency on SponsorLink OR NuGetizer. This is about *you* helping out the NuGetizer project itself. Thanks!") :
+                x)
+            .Select(x => x.IsKind(DiagnosticKind.UserNotSponsoring) ?
+                x.With(description: "Your sponsorship is used to further develop NuGetizer and make it great for the entire oss community!") :
+                x)
+            .ToImmutableArray();
+    }
+
+    public SponsorLinker() : base(settings) { }
 }