add README for extra word lists

lists/extra/README.md

@@ -0,0 +1,12 @@
+# Extra Wordlists
+This is a list of extra word lists for the project. The are not included in the
+HTML source, so they are not loaded when client loads the page. However, they
+are available if you want to use them.
+
+## Alternate
+### Colors
+This `alternative_colors_full.js` word list contains 2,433 colors to use. This
+will greatly increase the character count of the "Colors" generator, but I
+spent so much time putting this together, it would be a shame to throw it out.
+So, here it is. This does include the shortest 1,025 color names that are in
+the default list. So, this list only adds an extra 1,408 unique words.