Driver and example for SSD1306 128x64 I2C display (#254)

extras/ssd1306/README.md

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+# Driver for I2C SSD1306 128x64 OLED LCD
+
+This driver is written for usage with the ESP8266 and FreeRTOS ([esp-open-rtos](https://github.com/SuperHouse/esp-open-rtos)).
+
+### Usage
+
+Before using the SSD1306 LCD module, the function `i2c_init(SCL_PIN, SDA_PIN)` needs to be called to setup the I2C interface and then you must call ssd1306_init().
+
+#### Example 
+
+```
+#define SCL_PIN GPIO_ID_PIN(0)
+#define SDA_PIN GPIO_ID_PIN(2)
+...
+
+i2c_init(SCL_PIN, SDA_PIN);
+
+if (ssd1306_init()) {
+// An error occured, while performing SSD1306 init init (E.g device not found etc.)
+}
+
+// rest of the code
+```
+
+
+
+