updated Readme.md

README.md

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