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

odin/src/test_string.odin

@@ -0,0 +1,27 @@
+package main
+
+import "core:fmt"
+import "core:strings"
+
+main :: proc() {
+    // Test string building
+    builder: strings.Builder
+    strings.builder_init(&builder, context.temp_allocator)
+    
+    // Test 1: Using fmt.sbprintf
+    fmt.sbprintf(&builder, "{}", 123)
+    fmt.sbprintf(&builder, "{:09}", 456)
+    
+    result := strings.to_string(builder)
+    fmt.println("Result:", result)
+    
+    // Test 2: Using append to dynamic array
+    bytes: [dynamic]u8
+    append(&bytes, 51)  // 3
+    append(&bytes, 46)  // .
+    append(&bytes, 49)  // 1
+    append(&bytes, 52)  // 4
+    
+    str := string(bytes[:])
+    fmt.println("String from bytes:", str)
+}