LOC-17 Document client dependancies
LOC-17 Document client dependancies

--- a/client/README.md
+++ b/client/README.md
@@ -14,8 +14,13 @@
 
 ## Dependancies
 
+The following Python modules are required (other client dependancies should all already be present so long as you have python installed)
 
-`TODO`
+* urllib2
+* urwid
+* gnupg
+
+