Started gitbook in docs folder

Change-Id: Ifda129c3202855bba16a7c77e35b4351c9773655
diff --git a/book.json b/book.json
new file mode 100644
index 0000000..be589bb
--- /dev/null
+++ b/book.json
@@ -0,0 +1,4 @@
+{
+  "title": "XOS-GUI User Documentation",
+  "root": "./docs"
+}
\ No newline at end of file