GUI -- Added missing dependency to karma.conf.js

Change-Id: Id6cff0cae2847c387b1e20597ea112c7126f755f
diff --git a/web/gui/src/main/webapp/mock/README.txt b/web/gui/src/main/webapp/mock/README.txt
new file mode 100644
index 0000000..e864d95
--- /dev/null
+++ b/web/gui/src/main/webapp/mock/README.txt
@@ -0,0 +1,7 @@
+# The 'mock' directory contains code that can emulate the server-side of
+# a web socket (probably using node.js) to facilitate the manual injection
+# of (JSON structured) events, to aid in the development / debugging of
+# client side code.
+#
+# Each subdirectory will be per-view event data.
+#