Add AsyncFixer analyzer (#20)

Author: richardsondev

src/.editorconfig

@@ -9,3 +9,10 @@ dotnet_separate_import_directive_groups = true
 
 # Missing usings should be reported as error (IDE0005)
 dotnet_diagnostic.IDE0005.severity = error
+
+# AsyncFixer findings as errors
+dotnet_diagnostic.AsyncFixer01.severity = error
+dotnet_diagnostic.AsyncFixer02.severity = error
+dotnet_diagnostic.AsyncFixer03.severity = error
+dotnet_diagnostic.AsyncFixer04.severity = error
+dotnet_diagnostic.AsyncFixer05.severity = error

src/Directory.Packages.props

@@ -25,6 +25,7 @@
   </ItemGroup>
   <!-- Global packages -->
   <ItemGroup>
+    <GlobalPackageReference Include="AsyncFixer" Version="1.3.0" />
     <GlobalPackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="8.0.0" />
     <GlobalPackageReference Include="ReferenceTrimmer" Version="3.3.6" />
     <GlobalPackageReference Include="Roslynator.Analyzers" Version="4.12.4" />