Add Nelson-Aalen to main doc page

Also make the "planned functionality" checklist into a "functionality"
regular list.

README.md

@@ -6,9 +6,9 @@ A Julia package for performing [survival analysis](https://en.wikipedia.org/wiki
 [![Coveralls](https://coveralls.io/repos/github/ararslan/Survival.jl/badge.svg?branch=master)](https://coveralls.io/github/ararslan/Survival.jl?branch=master)
 [![](https://img.shields.io/badge/docs-latest-blue.svg)](https://ararslan.github.io/Survival.jl/latest)
 
-Planned functionality:
+Functionality:
 
- - [x] Time-to-event types
- - [x] Kaplan-Meier survival
- - [ ] Cox proportional hazards regression
- - [ ] Log-rank test
+* Time-to-event types
+* Kaplan-Meier survival
+* Nelson-Aalen cumulative hazard
+* Cox proportional hazards regression

docs/src/index.md

@@ -19,6 +19,7 @@ be installed using `Pkg.add("https://github.com/ararslan/Survival.jl")`.
 Pages = [
     "events.md",
     "km.md",
+    "na.md",
     "cox.md",
 ]
 Depth = 1