added documentation skeleton for etymology annotation #105

docs/source/etymology_annotation.rst

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+.. DO NOT REMOVE ANY foliaspec COMMENTS NOR EDIT THE TEXT BLOCK IMMEDIATELY FOLLOWING SUCH COMMENTS! THEY WILL BE AUTOMATICALLY UPDATED BY THE foliaspec TOOL!
+
+.. _etymology_annotation:
+
+Etymology Annotation
+==================================================================
+
+.. foliaspec:annotationtype_description(etymology)
+
+Specification
+---------------
+
+.. foliaspec:specification(etymology)
+
+Explanation
+-------------------------
+
+In etymology annotation, you can associate words or morphemes with their historical roots. The classes usually correspond to some kind of lexical ID in an etymological database.
+
+You can use :ref:`description_annotation` to optionally associate a human readable description with the etymology annotation (or any other annotation for that matter), or alternatively leave it up to the etymological set definition.
+
+The sets are, as always, user-defined and may correspond for instance with particular historical languages or language groups. The below example illustrates this, and multiple sets are used for multiple etymological annotations.
+
+
+Example
+-------------------------
+
+The following example shows sense annotations:
+
+.. literalinclude:: ../../examples/etymology.2.5.2.folia.xml
+    :linenos:
+    :language: xml
+
+