Add EEPROMClass and examples (espressif#1034)

* enchanced EEPROMClass

* Added eeprom examles and modified partition

* added eeprom class and extra examples

* No changes

* No changes

* added eeprom class and examples

* fixed typo

* length() returns user-defined sector size

* updated and annotated example

Author: fedy0

libraries/ArduinoOTA/examples/BasicOTA/BasicOTA.ino

@@ -65,4 +65,4 @@ void setup() {
 
 void loop() {
   ArduinoOTA.handle();
-}
+}