Add some TODOs to README, link to Bruce Allen's Github user page.

Author: brcolow

README.md

@@ -4,6 +4,12 @@ An implementation of the "Moody Method" for surface plate flatness.
 
 [Try It](https://brcolow.github.io/moodyjs/)
 
+## TODO
+
+* Add a way to show a semi-transparent plane that corresponds to grade "AA", "A", and "B" flatness. tolerance(AA) =  (40 + diagonal squared/25) x .000001″, A = tolerance(AA) * 2, B=tolerance(AA) * 4
+* Show a scale for the z-axis height values.
+* Add a thickness for the table slab (add manufacturer's label).
+
 ## Thanks To
 
-Bruce Allen - Published a very useful paper that corrects some mistakes from Moody's original magazine article and provides some useful citations.
+[Bruce Allen](https://github.com/ballen4705) - Published a very useful paper that corrects some mistakes from Moody's original magazine article and provides some useful citations.