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README.md

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+A simple calculator written in Java 21 implementing the shunting yard algorithm.
+
+# Example
+```Java
+public static void main(String[] args) {
+  final var calculator = new ShuntingYardExpressionEvaluator(new InfixExpressionTokeniser());
+  final var expression = "-3 + ((4 * 2) / ((1 - 5) ^ (2 ^ 3)))";
+  final var result = calculator.evaluate(expression); // -2.9998779296875
+}
+```