Implemented basic example showing flash string

flash/main.cpp

@@ -1,6 +1,28 @@
+#include <stddef.h>
+
 #include "flash/flash.hpp"
 
+size_t getSize(const detail::FlashString *flashString)
+{
+	size_t size = 0;
+
+	while (true) {
+		char ch = pgm_read_byte(reinterpret_cast<const char *>(flashString) + size);
+
+		if (ch == '\0')
+			break;
+
+		++size;
+	}
+
+	return size;
+}
+
 int main()
 {
+	auto flashString = F("Hello World!");
+
+	getSize(flashString);
+
 	return 0;
 }