Merge pull request SolrNet#192 from xaviermorera/patch-4

Update Highlighting documentation

Documentation/Highlighting.md

@@ -1,6 +1,8 @@
 # Highlighting
 
-This feature will "highlight" (typically with markup) the terms that matched the query, including a snippet of the text around the matched term.
+This feature will "highlight" (typically with markup) the terms that matched the query, including a snippet of the text around the matched term. 
+
+To enable highlighting please include a HighlightingParameters QueryOptions object where you include which fields you want to apply highlighting to.
 
 Sample code:
 
@@ -20,4 +22,12 @@ would print for example:
 features: <em>Noise</em>Guard, SilentSeek technology, Fluid Dynamic Bearing (FDB) motor
 ```
 
+The results object will include:
+- A Highlights property which is an IDictionary<string, SolrNet.Impl.HighlightedSnippets>. 
+- The string corresponds to the document uniquekey
+- The HighlightedSnippets is an IDictionary<string, ICollection<string>>. This object indicates which field is being returned, for example "features" and the snppet text "<em>Noise</em>Guard, SilentSeek technology, Fluid Dynamic Bearing (FDB) motor" 
+
+
+The returned tag corresponds to <em> although it can be configured directly in Solr to use a different tag. Also, if the request handler in Solr is configured to include highlights, it is not required to add the query options.
+
 For more details about this feature, see the [Solr wiki](http://wiki.apache.org/solr/HighlightingParameters) and the [reference guide](https://cwiki.apache.org/confluence/display/solr/Highlighting).