added more String examples

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

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+/*
+  String length() and trim()
+ 
+ Examples of how to use length() and trim() in a String
+ 
+ created 27 July 2010
+ by Tom Igoe
+ 
+ This example code is in the public domain.
+ */
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("\n\nString  length() and trim():");
+}
+
+void loop() {
+  // here's a String with empty spaces at the end (called white space):
+  String stringOne = "Hello!       ";
+  Serial.print(stringOne);
+  Serial.print("<--- end of string. Length: ");
+  Serial.println(stringOne.length());
+
+  // trim the white space off the string:
+  stringOne = stringOne.trim();
+  Serial.print(stringOne);
+  Serial.print("<--- end of trimmed string. Length: ");
+  Serial.println(stringOne.length());
+
+  // do nothing while true:
+  while(true);
+}
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