Add code coverage

Author: rdpeng

.Rbuildignore

@@ -4,3 +4,4 @@
 ^README-.*\.png$
 docs
 ^\.github$
+^codecov\.yml$

README.Rmd

@@ -2,7 +2,7 @@
 output: github_document
 ---
 
-[![R-CMD-check](https://github.com/rdpeng/queue/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/rdpeng/queue/actions/workflows/R-CMD-check.yaml)
+[![R-CMD-check](https://github.com/rdpeng/queue/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/rdpeng/queue/actions/workflows/R-CMD-check.yaml) [![Codecov test coverage](https://codecov.io/gh/rdpeng/queue/graph/badge.svg)](https://app.codecov.io/gh/rdpeng/queue)
 
 ```{r, echo = FALSE}
 knitr::opts_chunk$set(

README.md

@@ -1,5 +1,7 @@
 
 [![R-CMD-check](https://github.com/rdpeng/queue/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/rdpeng/queue/actions/workflows/R-CMD-check.yaml)
+[![Codecov test
+coverage](https://codecov.io/gh/rdpeng/queue/graph/badge.svg)](https://app.codecov.io/gh/rdpeng/queue)
 
 # queue
 
@@ -11,7 +13,7 @@ R.
 You can install queue from github with:
 
 ``` r
-# install.packages("remotes")
+# install.packages("remots")
 remotes::install_github("rdpeng/queue")
 ```