added debug printing for arduino

include/sta/debug/printing/printable_serial.hpp

@@ -0,0 +1,29 @@
+#ifndef STA_CORE_PRINTABLE_SERIAL_HPP
+#define STA_CORE_PRINTABLE_SERIAL_HPP
+
+#include <sta/debug/printing/printable.hpp>
+#ifdef STA_PLATFORM_ARDUINO
+
+namespace sta
+{
+    class PrintableSerial: public sta::BasePrintable
+    {
+    public:
+        /**
+         * @brief Construct a new Printable Serial object
+         */
+        PrintableSerial(unsigned long baud);
+
+        /**
+         * @brief Print string.
+         *
+         * @param str       String buffer
+         * @param length    String length
+         */
+        void print(const char * str, size_t length) override;
+    };
+} // namespace sta
+
+#endif // STA_PLATFORM_ARDUINO
+
+#endif // STA_CORE_PRINTABLE_SERIAL_HPP