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

swift/src/Package.swift

@@ -0,0 +1,15 @@
+// swift-tools-version:5.5
+import PackageDescription
+
+let package = Package(
+    name: "print_hej",
+    targets: [
+        .executableTarget(
+            name: "print_hej",
+            path: "."),
+        .testTarget(
+            name: "PiTests",
+            dependencies: ["print_hej"],
+            path: "."),
+    ]
+)