Add more examples - fix robot example

hardware/digistump/avr/libraries/DigisparkCDC/examples/CDC_LED/CDC_LED.ino

@@ -0,0 +1,22 @@
+#include <DigiCDC.h>
+void setup() {                
+  // initialize the digital pin as an output.
+  SerialUSB.begin(); 
+  pinMode(1,OUTPUT);
+}
+
+// the loop routine runs over and over again forever:
+void loop() {
+  
+  //turns led on and off based on sending 0 or 1 from serial terminal
+  if (SerialUSB.available()) {
+    char input = SerialUSB.read();
+    if(input == '0')
+      digitalWrite(1,LOW);
+    else if(input == '1')
+      digitalWrite(1,HIGH);
+      
+  }
+  
+   SerialUSB.delay(100);               // keep usb alive // can alos use SerialUSB.refresh();
+}