Add wcag contrast

Add wcag contrast

diff --git a/.gitmodules b/.gitmodules
index 657c8c2..3b19688 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -671,3 +671,6 @@
 [submodule "themes/discourse-blank-theme"]
 	path = themes/discourse-blank-theme
 	url = https://github.com/discourse/discourse-blank-theme
+[submodule "themes/discourse-wcag-contrast"]
+	path = themes/discourse-wcag-contrast
+	url = https://github.com/discourse/discourse-wcag-contrast
diff --git a/themes/discourse-wcag-contrast b/themes/discourse-wcag-contrast
new file mode 160000
index 0000000..4df52c4
--- /dev/null
+++ b/themes/discourse-wcag-contrast
@@ -0,0 +1 @@
+Subproject commit 4df52c410d7f2f79ed4dfeee1683300f1c50f403

GitHub sha: 82de5b40161ef39fc16b4a199ffc50c844349d0c