Add Screen Cleaning example

examples/3. Others/2-Inkplate_Clean_Screen/2-Inkplate_Clean_Screen.ino

@@ -0,0 +1,39 @@
+/*
+   2_Inkplate_Clean_Screen sketch for e-radionica.com Inkplate 6
+   Select "Inkplate 6(ESP32)" from Tools -> Board menu.
+   Don't have "Inkplate 6(ESP32)" option? Follow our tutorial and add it: 
+   https://e-radionica.com/en/blog/add-inkplate-6-to-arduino-ide/
+   
+   The burn-in effect is when you can see the previous picture on the screen faded in the background.
+   It is not unusual or defect, it's normal behaviour of e-paper screen. 
+   Nevertheless, sometime the burn-in effect can be too strong and noticeable. In that case, you can
+   run this sketch to clean your screen.
+
+   The sketch didn't help? Refrigerate your Inkplate for 60 minutes! 
+
+   NOTE: burn-in effect is much stronger at the direct sun of when exposed to heat source.
+   e-paper screens are not intedted to be used at strong sun and in hot enviroments.
+
+   Want to learn more about Inkplate? Visit www.inkplate.io
+   Looking to get support? Write on our forums: http://forum.e-radionica.com/en/
+   15 July 2020 by e-radionica.com
+*/
+
+#include <Inkplate.h>             //Add Inkplate library
+Inkplate display(INKPLATE_1BIT);  //Init the library
+
+void setup() {
+  display.begin();                //Call this only once! 
+
+  //We will write "empty" screen to the Inkplate screen for 10 times in the row.
+  //The result should be completly clean screen.
+  for(int i = 0; i < 10; i++){
+    display.clean();        //First, clean the buffer so it's completly empty
+    display.display();      //Now, send that empty buffer to the screen 10 times
+    delay(1000);            //Just a random delay, not actually needed
+  }
+}
+
+void loop() {
+  
+}