template: Add template for atom feed

template/quitesimple/feeds/atomentry

@@ -0,0 +1,7 @@
+<entry>
+    <title>{qswiki:var:entrytitle}</title>
+    <link href="{qswiki:var:entryurl}"/>
+    <id>{qswiki:var:entryid}</id>
+    <published>{qswiki:var:entrypublished}</published>
+    <content type="html">{qswiki:var:entrycontent}</content>
+</entry>