Add taxonomy to atlas search page (#138)

Author: rustagir

source/fundamentals/atlas-search.txt

@@ -4,6 +4,17 @@
 Atlas Search
 ============
 
+.. facet::
+   :name: genre
+   :values: reference
+
+.. facet::
+   :name: programming_language
+   :values: csharp
+
+.. meta::
+   :keywords: .NET, operators, aggregation, pipeline, atlas, code example
+
 .. contents:: On this page
    :local:
    :backlinks: none