added powershell for windows

.github/workflows/benchmark.yml

@@ -37,11 +37,23 @@ jobs:
       - name: Build the project
         run: cargo build --release
 
-      - name: Run benchmark
+      - name: Run benchmark (unix)
+        if: ${{ matrix.os != "windows-latest" }}
         run: |
           echo "Running benchmark for mining code..."
           start_time=$(date +%s%N)  # Get start time in nanoseconds
           ./target/release/mining-btc
           end_time=$(date +%s%N)  # Get end time in nanoseconds
           elapsed_time=$((end_time - start_time))  # Calculate elapsed time
           echo "Elapsed time: $((elapsed_time / 1000000)) ms"  # Convert to milliseconds
+      
+      - name: Run benchmark (windows)
+        if: ${{ matrix.os == "windows-latest" }}
+        shell: pwsh
+        run: |
+          Write-Output "Running benchmark for mining code..."
+          $startTime = [DateTime]::UtcNow.Ticks
+          ./target/release/mining-btc
+          $endTime = [DateTime]::UtcNow.Ticks
+          $elapsedTime = ($endTime - $startTime) / 10000  
+          Write-Output "Elapsed time: $elapsedTime ms"