Update README post CRAN release (#135)

* Add CRAN install instructions

* Add DOI badge

README.md

@@ -12,11 +12,18 @@ MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.or
 [![Codecov test
 coverage](https://codecov.io/gh/epiverse-trace/epico/branch/main/graph/badge.svg)](https://app.codecov.io/gh/epiverse-trace/epico?branch=main)
 [![lifecycle-maturing](https://raw.githubusercontent.com/reconverse/reconverse.github.io/master/images/badge-maturing.svg)](https://www.reconverse.org/lifecycle.html#maturing)
+[![DOI](https://zenodo.org/badge/550435309.svg)](https://zenodo.org/doi/10.5281/zenodo.11579611)
 <!-- badges: end -->
 
 ## Installation
 
-You can install the development version of *epiCo* from
+You can install the stable version of *epiCo* from CRAN with:
+
+``` r
+install.packages("epiCo")
+```
+
+You can also install the development version of *epiCo* from
 [GitHub](https://github.com/) with:
 
 ``` r