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

crystal/src/spec/pi_spec.cr

@@ -0,0 +1,50 @@
+require "spec"
+require "../print_hej"
+
+SCRIPT_PATH = "/Users/einand/Code/test/crystal/print_hej"
+
+def run_script(args = nil)
+  cmd = [SCRIPT_PATH]
+  cmd << args.to_s if args
+  output = `#{cmd.join(" ")}`
+  output.strip
+end
+
+describe "Pi calculation" do
+  it "calculates 10 decimals" do
+    result = run_script(10)
+    expected = "3.1415926535"
+    result.should eq(expected)
+  end
+  
+  it "calculates 5 decimals" do
+    result = run_script(5)
+    expected = "3.14159"
+    result.should eq(expected)
+  end
+  
+  it "calculates 1 decimal" do
+    result = run_script(1)
+    expected = "3.1"
+    result.should eq(expected)
+  end
+  
+  it "calculates 100 decimals" do
+    result = run_script(100)
+    expected = "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679"
+    result.should eq(expected)
+  end
+  
+  it "calculates default 100 decimals" do
+    result = run_script
+    expected = "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679"
+    result.should eq(expected)
+  end
+  
+  it "calculates 10000 decimals" do
+    result = run_script(10000)
+    # Check length: "3." + 10000 digits = 10002 characters
+    result.size.should eq(10002)
+    result.starts_with?("3.14159").should be_true
+  end
+end