Add project restore files and NuGet cache for GsaViewer

- Created project.nuget.cache to store NuGet package cache information.
- Added project.packagespec.json to define project restore settings and dependencies.
- Included rider.project.restore.info for Rider IDE integration.

obj/Debug/net9.0/.NETCoreApp,Version=v9.0.AssemblyAttributes.cs

@@ -0,0 +1,4 @@
+// <autogenerated />
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v9.0", FrameworkDisplayName = ".NET 9.0")]

obj/Debug/net9.0/Avalonia/Resources.Inputs.cache

@@ -0,0 +1 @@
+7e7dc0454609f380d65d4e6792d0f069435ad58b608973047eb829ce8ac3f4b4

obj/Debug/net9.0/GsaViewer.AssemblyInfo.cs

@@ -0,0 +1,22 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("GsaViewer")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")]
+[assembly: System.Reflection.AssemblyProductAttribute("GsaViewer")]
+[assembly: System.Reflection.AssemblyTitleAttribute("GsaViewer")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+
+// Généré par la classe MSBuild WriteCodeFragment.
+

obj/Debug/net9.0/GsaViewer.AssemblyInfoInputs.cache

@@ -0,0 +1 @@
+02bce5f0f4908bf808f9b59b3bc005e20eed825237a3bf3d65ea07bda1696b95

obj/Debug/net9.0/GsaViewer.GeneratedMSBuildEditorConfig.editorconfig

@@ -0,0 +1,28 @@
+is_global = true
+build_property.AvaloniaNameGeneratorIsEnabled = true
+build_property.AvaloniaNameGeneratorBehavior = InitializeComponent
+build_property.AvaloniaNameGeneratorDefaultFieldModifier = internal
+build_property.AvaloniaNameGeneratorFilterByPath = *
+build_property.AvaloniaNameGeneratorFilterByNamespace = *
+build_property.AvaloniaNameGeneratorViewFileNamingStrategy = NamespaceAndClassName
+build_property.AvaloniaNameGeneratorAttachDevTools = true
+build_property.TargetFramework = net9.0
+build_property.TargetPlatformMinVersion = 
+build_property.UsingMicrosoftNETSdkWeb = 
+build_property.ProjectTypeGuids = 
+build_property.InvariantGlobalization = 
+build_property.PlatformNeutralAssembly = 
+build_property.EnforceExtendedAnalyzerRules = 
+build_property._SupportedPlatformList = Linux,macOS,Windows
+build_property.RootNamespace = GsaViewer
+build_property.ProjectDir = C:\Users\simulateur\Desktop\GsaViewer\
+build_property.EnableComHosting = 
+build_property.EnableGeneratedComInterfaceComImportInterop = 
+build_property.EffectiveAnalysisLevelStyle = 9.0
+build_property.EnableCodeStyleSeverity = 
+
+[C:/Users/simulateur/Desktop/GsaViewer/App.axaml]
+build_metadata.AdditionalFiles.SourceItemGroup = AvaloniaXaml
+
+[C:/Users/simulateur/Desktop/GsaViewer/Views/MainWindow.axaml]
+build_metadata.AdditionalFiles.SourceItemGroup = AvaloniaXaml