Add GitHub Actions workflow, baseline results, and documentation for performance benchmarks

Co-authored-by: adamhathcock <527620+adamhathcock@users.noreply.github.com>

.github/workflows/performance-benchmarks.yml

@@ -0,0 +1,66 @@
+name: Performance Benchmarks
+
+on:
+  push:
+    branches:
+      - 'master'
+      - 'release'
+  pull_request:
+    branches:
+      - 'master'
+      - 'release'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  benchmark:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v6
+      with:
+        fetch-depth: 0
+    
+    - uses: actions/setup-dotnet@v5
+      with:
+        dotnet-version: 10.0.x
+    
+    - name: Build Performance Project
+      run: dotnet build tests/SharpCompress.Performance/SharpCompress.Performance.csproj --configuration Release
+    
+    - name: Run Benchmarks
+      run: dotnet run --project tests/SharpCompress.Performance/SharpCompress.Performance.csproj --configuration Release --no-build -- --filter "*" --exporters json markdown --artifacts benchmark-results
+      continue-on-error: true
+    
+    - name: Display Benchmark Results
+      if: always()
+      run: |
+        echo "## Benchmark Results" >> $GITHUB_STEP_SUMMARY
+        echo "" >> $GITHUB_STEP_SUMMARY
+        if [ -d "benchmark-results/results" ]; then
+          for file in benchmark-results/results/*-report-github.md; do
+            if [ -f "$file" ]; then
+              cat "$file" >> $GITHUB_STEP_SUMMARY
+              echo "" >> $GITHUB_STEP_SUMMARY
+            fi
+          done
+        fi
+    
+    - name: Compare with Baseline
+      if: always()
+      run: |
+        echo "## Comparison with Baseline" >> $GITHUB_STEP_SUMMARY
+        echo "" >> $GITHUB_STEP_SUMMARY
+        echo "Baseline results are stored in tests/SharpCompress.Performance/baseline-results.md" >> $GITHUB_STEP_SUMMARY
+        echo "" >> $GITHUB_STEP_SUMMARY
+        echo "### Baseline Results" >> $GITHUB_STEP_SUMMARY
+        cat tests/SharpCompress.Performance/baseline-results.md >> $GITHUB_STEP_SUMMARY || echo "Baseline file not found" >> $GITHUB_STEP_SUMMARY
+    
+    - name: Upload Benchmark Results
+      if: always()
+      uses: actions/upload-artifact@v6
+      with:
+        name: benchmark-results
+        path: benchmark-results/