Add Tiny SoftwareSerial example

This example shows how to use softwareSerial in a ATtiny device using
the ATtiny core

examples/TinySoftWareSerial/Makefile

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+# Arduino Make file. Refer to https://github.com/sudar/Arduino-Makefile
+
+BOARD_TAG    = attiny85-8
+ARDUINO_VAR_PATH = /home/sudar/Dropbox/code/arduino-sketches/hardware/attiny/variants
+BOARDS_TXT = /home/sudar/Dropbox/code/arduino-sketches/hardware/attiny/boards.txt
+ISP_PORT = /dev/ttyACM*
+
+ARDUINO_LIBS = SoftwareSerial
+
+include $(ARDMK_DIR)/arduino-mk/Arduino.mk
+
+# !!! Important. You have to use make ispload to upload when using ISP programmer

examples/TinySoftWareSerial/TinySoftwareSerial.ino

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+#include <SoftwareSerial.h>
+
+SoftwareSerial mySerial(3, 4); // RX, TX
+
+void setup() {  
+    mySerial.begin(9600);
+}
+
+void loop() {
+    mySerial.println(millis()); 
+    delay(1000);
+}