Added readme.md to PCB design

KiCad_M644_breakout_v1.2d/README.md

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+# AtMega 8535/16/32/324/644/1284 generic board
+
+### Briefly about the features of the scheme:
+* Nearly all GPIO pins connected to PLS terminals.
+* Two GPIOs are connected: button (SW1 / PC5) and the LED (LED1 / PC4).
+* External pull-up on UART RX0 / RX1.
+* R-dividers for 3.3V-TTL on UART TX0 / TX1.
+* SPI pins for 3 devices connected to (for example):
+Ethernet (Wiz5500 / ENC28J60), Sd-Card, CAN MCP2515 and so on ...
+* Compatible with **Arduino Sanguino/Mightycore**
+
+#### Schematic:
+
+<img src="../KiCad_M644_breakout_v1.2d/Pictures/M644_breakout_v1.2d_schematic.png" alt="m1284p schematic" width="90%" height="90%">
+
+#### This is my own custom board looks like:
+
+<img src="../KiCad_M644_breakout_v1.2d/Pictures/M644_breakout_v1.2d-a_top.png" alt="m1284p 3D top" width="50%" height="50%">
+
+#### Pinmap board (Sanguino notation):
+
+<img src="../KiCad_M644_breakout_v1.2d/Pictures/M644_breakout_v1.2d_pinmap.png" alt="m1284p pinmap" width="50%" height="50%">
+
+## Author
+* **Ibragimov Maksim aka maxxir**
+08/04/2019