Added SPI based SSD1306 demo

SSD1306_SPI_Arduino/SSD1306_SPI_Arduino.ino

@@ -0,0 +1,57 @@
+/* 
+ * Developed By Dhanish Vijayan @ Elementz Engineers Guild Pvt Ltd
+ * 
+ * Demo for SSD1306 based 128x64 OLED module using Adafruit SSD1306 and SPI
+ * library (https://github.com/adafruit/Adafruit_SSD1306).
+ * 
+ * See https://github.com/pacodelgado/arduino/wiki/SSD1306-based-OLED-connected-to-Arduino 
+ * for more information.
+ *
+ *  Pin  Alternate Names Description    Arduino PINOUT
+ *  VCC  Power supply                   VCC(5V)
+ *  GND  Ground                         GND
+ *  D0   SCL,CLK,SCK Clock              11
+ *  D1   SDA,MOSI  Data                 12
+ *  RES  RST,RESET Rest                 9
+ *  DC   A0  Data/Command               8
+ *  CS   Chip Select                    10
+ */
+
+#include <SPI.h>
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+
+// If using software SPI (the default case):
+#define OLED_MOSI  11   //D1
+#define OLED_CLK   12   //D0
+#define OLED_DC    9
+#define OLED_CS    8
+#define OLED_RESET 10
+
+Adafruit_SSD1306 display(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
+
+void setup()   {                
+//  Serial.begin(9600);
+  display.begin(SSD1306_SWITCHCAPVCC);
+  display.display();
+  delay(1000);
+  display.clearDisplay();
+  display.setTextSize(1);
+  display.setTextColor(WHITE);
+}
+
+void loop()
+{
+  static unsigned long thisMicros = 0;
+  static unsigned long lastMicros = 0;
+  display.clearDisplay();
+  display.setCursor(0,0);
+  display.print("Elementz Engineers Guild Pvt Ltd \n");
+  display.print("Kudos!! It works... \n");
+  display.print(thisMicros - lastMicros);
+  display.print(" microseconds");
+  display.display();
+  lastMicros = thisMicros;
+  thisMicros = micros();
+}