Update intro with status

hdgarrood · May 5, 2017 · 45a9098 · 45a9098
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@@ -6,6 +6,18 @@ behind the numeric hierarchy of type classes in PureScript's Prelude, aimed at
 people who haven't (necessarily) studied mathematics beyond a high-school
 level.
 
+Status
+------
+
+Beta. There are still quite a few chapters I want to write. In particular, the
+following are currently missing:
+
+* Euclidean domains
+* Fields
+* Complex numbers (a very important example of a field)
+* Semirings
+* When two rings are "the same" (and what that means)
+
 Why?
 ----