Add schematic and breadboard views. 🎨

README.md

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 > MCP4141 and ATtiny13 based digital potentiometer to replace an
 > existing 3 terminal analog potentiometers.
 
+![Breadboard View](https://github.com/dilshan/mcp4141-digital-pot/raw/master/resources/digipot_breadboard.jpg)
+
 The main objective of this project is to create a prototype version of a digital potentiometer using *Microchip*'s MCP4141 IC. MCP4141 is available with end-to-end resistances of 5KΩ, 10KΩ, 50kΩ, and 100KΩ. This potentiometer-module can drive MCP4141 with any of the above mention resistances.
 
 To drive the MCP4141, this module use ATtiny13 MCU. This MCU control MCP4141's resistance, based on the rotary-encoder events. ATtiny13 is an 8-pin, low power 8-bit MCU with an internal oscillator. The key reason to pick this MCU is its availability and lower price. Due to a lack of hardware-based SPI, this system use bit-banging SPI implementation to drive the MCP4141 IC. 
 
+![Schematic](https://raw.githubusercontent.com/dilshan/mcp4141-digital-pot/master/resources/schematic.svg?sanitize=true)
+
 To reduce the board size, this module employs only 3 components. Which including ATtiny13, MCP4141, and rotary-encoder. The dimension of the PCB design given for this module is 26.16mm x 29.72mm. 
 
 ## Building and flash firmware