add src files

src/modules/ordinal.lua

@@ -0,0 +1,9 @@
+s=string.sub;t=tonumber
+return function(n)
+    local o, d = {"st", "nd", "rd"}, s(n, -1)
+    if t(d) > 0 and t(d) <= 3 and s(n,-2) ~= 11 and s(n,-2) ~= 12 and s(n,-2) ~= 13 then
+        return n .. o[t(d)]
+    else
+        return n .. "th"
+    end
+end