feat: add std example

examples/fmt_to_string_std.rs

@@ -0,0 +1,25 @@
+use color_backtrace::BacktracePrinter;
+
+fn main() -> Result<(), std::io::Error> {
+    // Start your trace
+    let trace = std::backtrace::Backtrace::force_capture();
+
+    // Do stuff...
+
+    // And print!
+    let bt = color_backtrace::btparse::deserialize(&trace).unwrap();
+    let printer = BacktracePrinter::default();
+    let str = printer.format_trace_to_string(&bt)?;
+
+    if cfg!(windows) {
+        println!(
+            "Warning: on Windows, you'll have to enable VT100 \
+             printing for your app in order for this to work \
+             correctly. This example doesn't do this."
+        );
+    }
+
+    println!("{}", str);
+
+    Ok(())
+}