Add single-user password utils (#9)

- Constrain images to reading viewport

src/cli-start.php

@@ -28,3 +28,17 @@ function cli_title(string $title): void {
     printfn('  | %s | %s |', $title, $appTitle);
     printfn($dashes . PHP_EOL);
 }
+
+/**
+ * Capitalize the first letter of the given string
+ *
+ * @param string $value The string to be capitalized
+ * @return string The given string with the first letter capitalized
+ */
+function init_cap(string $value): string {
+    return match (strlen($value)) {
+        0       => "",
+        1       => strtoupper($value),
+        default => strtoupper(substr($value, 0, 1)) . substr($value, 1),
+    };
+}