[example] Add Nucleo-L552ZE-Q freertos blink example

examples/nucleo_l552ze-q/freertos_blink/main.cpp

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+/*
+ * Copyright (c) 2020, Mike Wolfram
+ *
+ * This file is part of the modm project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+// ----------------------------------------------------------------------------
+
+#include <modm/board.hpp>
+#include <modm/processing/rtos.hpp>
+
+using namespace Board;
+
+class BlinkTask : modm::rtos::Thread
+{
+public:
+	BlinkTask()
+		: Thread(4, 2048, "blink")
+	{}
+
+	void
+	run()
+	{
+		Leds::setOutput();
+		while (true)
+		{
+			vTaskDelay(500 * (configTICK_RATE_HZ / 1000.0));
+			Leds::toggle();
+		}
+	}
+};
+
+BlinkTask blinkTask;
+
+int
+main()
+{
+	Board::initialize();
+
+	MODM_LOG_INFO << "\n\nReboot: FreeRTOS blink example" << modm::endl;
+
+	modm::rtos::Scheduler::schedule();
+
+	// we should never get here
+	return 0;
+}

examples/nucleo_l552ze-q/freertos_blink/project.xml

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+<library>
+  <extends>modm:nucleo-l552ze-q</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/nucleo_l552ze-q/freertos_blink</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+    <module>modm:freertos</module>
+    <module>modm:processing:rtos</module>
+  </modules>
+</library>