refactor: move solution file to src/ directory (#26)

* refactor: move solution file to src/ directory

Moves .slnx from root to src/ for consistency with other repos.
Updates project paths to be relative to new location.

* fix: update workflow to reference new solution path

Author: CalvinAllen

.github/workflows/build.yml

@@ -20,10 +20,10 @@ jobs:
         dotnet-version: '8.0.x'
 
     - name: Restore dependencies
-      run: dotnet restore
+      run: dotnet restore src/CodingWithCalvin.Otel4Vsix.slnx
 
     - name: Build
-      run: dotnet build --configuration Release --no-restore
+      run: dotnet build src/CodingWithCalvin.Otel4Vsix.slnx --configuration Release --no-restore
 
     - name: Upload build artifacts
       uses: actions/upload-artifact@v4

CodingWithCalvin.Otel4Vsix.slnx

@@ -0,0 +1,8 @@
+<Solution>
+  <Folder Name="/src/">
+    <Project Path="CodingWithCalvin.Otel4Vsix/CodingWithCalvin.Otel4Vsix.csproj" />
+  </Folder>
+  <Folder Name="/tests/">
+    <Project Path="../tests/CodingWithCalvin.Otel4Vsix.Tests/CodingWithCalvin.Otel4Vsix.Tests.csproj" />
+  </Folder>
+</Solution>