Added hardware screenshots.

README.md

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 #### A guide covering Arduino devices such as the Arduino Uno and Arduino Nano. Along with the tools, applications and libraries that will make you a better and more efficient developer with Arduino devices. Also, learn about cool projects that you can build with your Arduino device.
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+[Checkout the Arduino Starter Kit](https://store.arduino.cc/usa/arduino-starter-kit)
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+<img src="https://user-images.githubusercontent.com/45159366/104068309-8a898500-51b9-11eb-9265-beb5a28e649b.jpg">
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+[Checkout the Arduino Uno](https://store.arduino.cc/usa/arduino-uno-rev3)
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+<img src="https://user-images.githubusercontent.com/45159366/104068324-8eb5a280-51b9-11eb-942c-390f5b29b259.jpg">
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+**Arduino Uno Hardware Specs**
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+ - Microcontroller	ATmega328P
+ - Operating Voltage	5V
+ - Input Voltage (recommended)	7-12V
+ - Input Voltage (limit)	6-20V
+ - Digital I/O Pins	14 (of which 6 provide PWM output)
+ - Flash Memory	32 KB (ATmega328P) of which 0.5 KB used by bootloader
+ - SRAM	2 KB (ATmega328P)
+ - EEPROM	1 KB (ATmega328P)
+ - Clock Speed	16 MHz
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+ [Checkout the Arduino Nano](https://store.arduino.cc/usa/arduino-nano)
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+<img src="https://user-images.githubusercontent.com/45159366/104068320-8d847580-51b9-11eb-960d-8faa3ef525fc.jpg">
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+**Arduino Nano Hardware Specs**
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+ - Microcontroller	ATmega328
+ - Architecture	AVR
+ - Operating Voltage	5 V
+ - Flash Memory	32 KB of which 2 KB used by bootloader
+ - SRAM	2 KB
+ - Clock Speed	16 MHz
+ - Input Voltage	7-12 V
+ - Digital I/O Pins	22 (6 of which are PWM)
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