move the Wrapper-Project out of the root directory and change readme and docs

arduboy-rust/Wrapper-Project/src/library/arduino/arduino_export.h

@@ -0,0 +1,18 @@
+#pragma once
+#include <Arduboy2.h>
+
+extern "C"
+{
+    long arduino_random_between(long min, long max)
+    {
+        return random(min, max);
+    }
+    long arduino_random_less_than(long max)
+    {
+        return random(max);
+    }
+    void arduino_delay(unsigned long ms)
+    {
+        delay(ms);
+    }
+}