Readme.md updated

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README.md

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+Lesson 1 Blinking LED
+Lesson 2 Controlling an LED with a button
+Lesson 3 LED Flowing Lights
+Lesson 4 Breathing LED 
+Lesson 5 Controlling a RGB LED by PWM
+Lesson 6 7-segment display 
+Lesson 7 LCD1602 
+Lesson 8 Photoresistor 
+Lesson 9 Serial Port
+Lesson 10 DC motor