Updated ICharSequence with the code comments and license from Apache Harmony.
Updated ICharSequence with the code comments and license from Apache Harmony.

apache/lucenenet,jeme/lucenenet,apache/lucenenet,NightOwl888/lucenenet,jeme/lucenenet,sisve/lucenenet,jeme/lucenenet,apache/lucenenet,NightOwl888/lucenenet,sisve/lucenenet,laimis/lucenenet,NightOwl888/lucenenet,NightOwl888/lucenenet,laimis/lucenenet,jeme/lucenenet,apache/lucenenet