Documentation

[mikegoatly]

This is a placeholder issue to track the documentation that needs to be written:

• Programatically traversing the index using index.CreateNavigator()
• Different tokenization options, including stemming
• Support for async indexing of an item's field
• Serialization of non-standard index key types
• Enumeration of indexed words
• Getting set up - installing from nuget
• Responding to index changes using index modification actions
• Using the XML tokenizer
• Improving indexing with batch processing
• Writing custom text extractors
• Using a custom tokenizer
• Directly using a tokenizer to verify the tokens that are being returned
  ... more to come