Moving files away from the root in appropriate directories

Change-Id: I33d09337338a11bfd794cc472b7bb9650f9c5d83
diff --git a/book.json b/book.json
index 47ff947..2f0702d 100644
--- a/book.json
+++ b/book.json
@@ -2,7 +2,8 @@
   "title": "CORD Guide",
   "root": ".",
   "structure": {
-    "summary": "SUMMARY.md"
+    "summary": "SUMMARY.md",
+    "glossary": "terminology.md"
   },
   "styles": {
     "website": "styles/website.css"