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

d/cmd/build.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# D Build Script
+
+SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$SCRIPT_DIR"
+
+echo "=== D Build ==="
+echo ""
+
+# Kompilera D-programmet
+ldc2 -of bin/print_hej src/print_hej.d
+
+if [ $? -eq 0 ]; then
+    echo "✓ Kompilering lyckades!"
+    echo "Binär: bin/print_hej"
+    echo ""
+    echo "För att köra:"
+    echo "  ./bin/print_hej [decimaler]"
+else
+    echo "✗ Kompilering misslyckades!"
+    exit 1
+fi

d/cmd/test.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# D Unit Tests
+
+SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$SCRIPT_DIR"
+
+echo "=== D Pi-beräkning Unit Tester ==="
+echo ""
+
+# Kompilera och kör pi_test
+ldc2 -o bin/pi_test src/pi_test.d
+if [ $? -eq 0 ]; then
+    ./bin/pi_test
+    exit $?
+else
+    echo "✗ Kompilering av tester misslyckades!"
+    exit 1
+fi