add SPI example

Author: Neutree

libraries/SPI/examples/basic.ino libraries/SPI/examples/basic/basic.inolibraries/SPI/examples/basic.ino renamed to libraries/SPI/examples/basic/basic.ino

@@ -1,6 +1,11 @@
 #include "SPI.h"
 
 SPIClass spi0(SPI0);
+#ifdef K210
+#error "11111111"
+#else
+#error "222222"
+#endif
 
 void setup()
 {