Add random invitee theme

Add random invitee theme

diff --git a/.gitmodules b/.gitmodules
index eb2ed05..41ab12b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -659,3 +659,6 @@
 [submodule "themes/discourse-pm-bubbles"]
 	path = themes/discourse-pm-bubbles
 	url = https://github.com/discourse/discourse-pm-bubbles
+[submodule "themes/discourse-random-invitee-list"]
+	path = themes/discourse-random-invitee-list
+	url = https://github.com/jjaffeux/discourse-random-invitee-list
diff --git a/themes/discourse-random-invitee-list b/themes/discourse-random-invitee-list
new file mode 160000
index 0000000..916a58f
--- /dev/null
+++ b/themes/discourse-random-invitee-list
@@ -0,0 +1 @@
+Subproject commit 916a58fb2ee0e50c53c4cbb479834bb49d680a68

GitHub sha: bad04d795b04e1298df365370b3c6d6e07567219