Add configuration page

Author: SerafimArts

Writerside/boson.tree

@@ -8,7 +8,7 @@
         <toc-element topic="introduction.md"
             toc-title="Introduction" />
         <toc-element topic="installation.md" />
-        <toc-element toc-title="Configuration" />
+        <toc-element topic="configuration.md" />
         <toc-element toc-title="Development" />
         <toc-element toc-title="Debugging" />
         <toc-element toc-title="Roadmap" />

Writerside/cfg/glossary.xml

@@ -3,4 +3,5 @@
 <terms>
     <term name="FQN">Fully Qualified Name</term>
     <term name="TODO">This functionality is not implemented at the moment</term>
+    <term name="optional class">Can be created without requiring any mandatory arguments.</term>
 </terms>