Added core String library examples

build/shared/examples/8.Strings/StringAdditionOperator/StringAdditionOperator.pde

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+/*
+  Adding Strings together
+ 
+ Examples of how to add strings together
+ You can also add several different data types to string, as shown here:
+ 
+ The circuit:  No external hardware needed.
+ 
+ created 27 July 2010
+ by Tom Igoe
+ 
+ This example code is in the public domain.
+ 
+ */
+
+// declare three strings:
+String stringOne, stringTwo, stringThree;
+
+void setup() {
+  Serial.begin(9600);
+  stringOne = String("stringThree = ");
+  stringTwo = String("this string");
+  stringThree = String ();
+  Serial.println("\n\nAdding strings together (concatenation):");
+}
+
+void loop() {
+  // adding a constant integer to a string:
+  stringThree =  stringOne + 123;
+  Serial.println(stringThree);    // prints "You added 123"
+
+  // adding a constant long interger to a string:
+  stringThree = stringOne + 123456789;
+  Serial.println(stringThree);    // prints " You added 123456789"
+
+  // adding a constant character to a string:
+  stringThree =  stringOne + 'A';
+  Serial.println(stringThree);    // prints "You added A"
+
+  // adding a constant string to a string:
+  stringThree =  stringOne +  "abc";
+  Serial.println(stringThree);    // prints "You added abc"
+
+  stringThree = stringOne + stringTwo;
+  Serial.println(stringThree);    // prints "You added this string"
+
+  // adding a variable integer to a string:
+  int sensorValue = analogRead(0);
+  stringOne = "Sensor value: ";
+  stringThree = stringOne  + sensorValue;
+  Serial.println(stringThree);    // prints "Sensor Value: 401" or whatever value analogRead(0) has
+
+  // adding a variable long integer to a string:
+  long currentTime = millis();
+  stringOne="millis() value: ";
+  stringThree = stringOne + millis();
+  Serial.println(stringThree);    // prints "The millis: 345345" or whatever value currentTime has
+
+  // do nothing while true:
+  while(true);
+}
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