migrate (.sln -> .slnx): we now use the .slnx format to store the sol…

…ution

Laerdal.McuMgr.slnx

@@ -0,0 +1,23 @@
+<Solution>
+    <Folder Name="/_Misc/">
+        <File Path="README.md"/>
+        <File Path="LICENSE"/>
+        <File Path=".gitignore"/>
+        <File Path="azure-pipelines.yml"/>
+        <File Path="Laerdal.Scripts\Laerdal.CreateNewReleaseInGithub.sh"/>
+        <File Path="Laerdal.Scripts\Laerdal.Builder.targets"/>
+        <File Path="Laerdal.Scripts\Laerdal.Version.sh"/>
+        <File Path="global.json"/>
+        <File Path="Laerdal.Scripts\Laerdal.SetupBuildEnvironment.sh"/>
+        <File Path=".github\workflows\github-actions.yml"/>
+        <File Path="Laerdal.Scripts\Laerdal.GenerateSignAndUploadSbom.sh"/>
+    </Folder>
+    <Folder Name="/_Tests/">
+        <Project Path="Laerdal.McuMgr.Tests\Laerdal.McuMgr.Tests.csproj" Type="Classic C#"/>
+    </Folder>
+    <Project Path="Laerdal.McuMgr.Bindings.Android\Laerdal.McuMgr.Bindings.Android.csproj" Type="Classic C#"/>
+    <Project Path="Laerdal.McuMgr.Bindings.iOS\Laerdal.McuMgr.Bindings.iOS.csproj" Type="Classic C#"/>
+    <Project Path="Laerdal.McuMgr.Bindings.MacCatalyst\Laerdal.McuMgr.Bindings.MacCatalyst.csproj" Type="Classic C#"/>
+    <Project Path="Laerdal.McuMgr.Bindings.NetStandard\Laerdal.McuMgr.Bindings.NetStandard.csproj" Type="Classic C#"/>
+    <Project Path="Laerdal.McuMgr\Laerdal.McuMgr.csproj" Type="Classic C#"/>
+</Solution>