TASK: Add documentation about the highlight feature

Author: daniellienert

README.md

@@ -438,10 +438,26 @@ As **value**, the following methods accept a simple type, a node object or a Dat
 |`lessThanOrEqual('propertyName', value, [clauseType])`|Range filter with property values less than or equal to the given value|
 |`sortAsc('propertyName')` / `sortDesc('propertyName')`|Can also be used multiple times, e.g. `sortAsc('tag').sortDesc('date')` will first sort by tag ascending, and then by date descending.|
 |`limit(5)`                                            |Only return five results. If not specified, the default limit by Elasticsearch applies (which is at 10 by default)|
-|`from(5)`                                             |Return the results starting from the 6th one|
-|`prefix('propertyName', 'prefix', [clauseType])`      |Adds a prefix filter on the given field with the given prefix|
-|`geoDistance(propertyName, geoPoint, distance, [clauseType])` |Filters documents that include only hits that exists within a specific distance from a geo point.|
-|`fulltext('searchWord', options)`                     |Does a query_string query on the Fulltext index using the searchword and additional [options](https://www.elastic.co/guide/en/elasticsearch/reference/7.6/query-dsl-query-string-query.html) to the query_string|
+|`from(5)`                                                        |Return the results starting from the 6th one|
+|`prefix('propertyName', 'prefix', [clauseType])`                 |Adds a prefix filter on the given field with the given prefix|
+|`geoDistance(propertyName, geoPoint, distance, [clauseType])`.   |Filters documents that include only hits that exists within a specific distance from a geo point.|
+|`fulltext('searchWord', options)`                                |Does a query_string query on the Fulltext index using the searchword and additional [options](https://www.elastic.co/guide/en/elasticsearch/reference/7.6/query-dsl-query-string-query.html) to the query_string|
+|`highlight(fragmentSize, fragmentCount, noMatchSize, field)`     |Configure result highlighting for every fulltext field individually|
+
+## Search Result Highlighting
+
+When using the `.fulltext()` oprtator to do a fulltext, **highlight snippets** ([elasticsearch documentation](https://www.elastic.co/guide/en/elasticsearch/reference/7.17/highlighting.html#highlighting)) are automatically queried. By default snippets with 150 characters are queried for all available fulltext fields with a 150 character fallback text. 
+
+To adjust this behavior you can first deactivate the default and then configure highlighting for every field individually:
+
+	Search.highlight(false).highlight(150, 2, 150, 'neos_fulltext.text').highlight(100, 1, 0, 'neos_fulltext.h2')
+
+This deactivates the default highlighting and then queries 2 snipets of 150 characters each from hits in `neos_fulltext.text`, with a fallback to 150 charchters of the beginning of the text if no match was found and additional 100 characters from `neos_fulltext.h2` without a fallback.
+
+The highlight snippets can be accessed by
+
+	highlight = ${Search(...).execute().searchHitForNode(node).highlight}
+
 
 ## moreLikeThis(like, fields, options)