change folder names, remove duplicate DigiJoystick folder

hardware/digistump/avr/libraries/DigisparkUSB/examples/Echo/Echo.ino

@@ -0,0 +1,31 @@
+#include <DigiUSB.h>
+
+void setup() {
+  DigiUSB.begin();
+}
+
+void get_input() {
+  int lastRead;
+  // when there are no characters to read, or the character isn't a newline
+  while (true) { // loop forever
+    if (DigiUSB.available()) {
+      // something to read
+      lastRead = DigiUSB.read();
+      DigiUSB.write(lastRead);
+      
+      if (lastRead == '\n') {
+        break; // when we get a newline, break out of loop
+      }
+    }
+    
+    // refresh the usb port for 10 milliseconds
+    DigiUSB.delay(10);
+  }
+}
+
+void loop() {
+  // print output
+  DigiUSB.println("Waiting for input...");
+  // get input
+  get_input();
+}