Initial commit: Pi calculation benchmark with 34 languages

- Added implementations for: bash, brainfuck, c, cpp, crystal, csharp, d, dart, elixir, erlang, fortran, go, haskell, java, javascript, julia, kotlin, objective-c, scala, typescript, lua, nim, odin, perl, php, python, r, ruby, rust, swift, zig, assembly, vimscript, wolfram
- All implementations use Machin's formula: π/4 = 4*arctan(1/5) - arctan(1/239)
- Build system with ./build.sh, test system with ./test.sh
- Performance testing with ./run_all.sh
- Comprehensive README.md explaining performance differences
- Test framework verifies correctness against known π values

csharp/cmd/build.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# C# Build Script
+
+SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$SCRIPT_DIR"
+
+echo "=== C# Build ==="
+echo ""
+
+# Kompilera C#-programmet
+cd src
+dotnet build -c Release
+
+if [ $? -eq 0 ]; then
+    # Hitta rätt .NET-version dynamiskt
+    DOTNET_VERSION=$(ls -1 bin/Release/ | grep -E '^net[0-9]+\.[0-9]+$' | head -1)
+    
+    echo "✓ Kompilering lyckades!"
+    echo "Binär: src/bin/Release/$DOTNET_VERSION/print_hej"
+    echo ""
+    echo "För att köra:"
+    echo "  dotnet src/bin/Release/$DOTNET_VERSION/print_hej.dll [decimaler]"
+    
+    # Skapa wrapper script
+    mkdir -p ../bin
+    cat > ../bin/print_hej << EOF
+#!/bin/bash
+SCRIPT_DIR="\$(cd "\$(dirname "\$0")/.." && pwd)"
+cd "\$SCRIPT_DIR"
+dotnet src/bin/Release/$DOTNET_VERSION/print_hej.dll "\$@"
+EOF
+    chmod +x ../bin/print_hej
+    echo "Wrapper script skapad: bin/print_hej"
+else
+    echo "✗ Kompilering misslyckades!"
+    exit 1
+fi

csharp/cmd/test.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+# C# Unit Tests
+
+SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$SCRIPT_DIR"
+
+echo "=== C# Pi-beräkning Unit Tester ==="
+echo ""
+
+cd src
+dotnet test
+
+exit $?