Updated README with usage

This library has the pins hardcoded and so they are recorded in the
README. Also added the additional tweaks done by Massey101.

README.md

@@ -11,7 +11,50 @@ and parts of https://github.com/adafruit/Adafruit-GFX-Library/
 Tweaks
 ------
 
+By LongHairedHacker:
+
 * Uses my own bitmap format for fullcolor and monochrome bitmaps
 * Faster line drawing based on: https://github.com/adafruit/Adafruit-GFX-Library/pull/36
 * Faster font rendering based on https://github.com/adafruit/Adafruit-GFX-Library/issues/69
 * Refactored draw_char function that does not load glyph struct twice
+
+By Massey101:
+
+* Added support for bitmap clipping
+* Added JAYCAR screen for XC4629 support
+
+
+Usage
+-----
+
+Connect the display to the following PINS:
+
+JAYCAR screen and ATMEGA328:
++--------+--------+
+| Screen | AVR    |
++--------+--------+
+| VCC    | 5V     |
++--------+--------+
+| GND    | GND    |
++--------+--------+
+| CS     | PB2    |
++--------+--------+
+| RESET  | PD7    |
++--------+--------+
+| A0     | PD6    |
++--------+--------+
+| SDA    | PB3    |
++--------+--------+
+| SCK    | PB5    |
++--------+--------+
+| LED    | 3.3V   |
++--------+--------+
+
+
+1. Set the environment variables for:
+  - `AVRMCU` - Your avr chip
+  - `F_CPU` - Your clock speed
+  - `ISPPORT` - programming device
+2. Modify `include/st7735.h:st7735_type` to your screen. (I have no idea how to
+   figure out which is which)
+3. Run `make flash`