update documentation

README.md

@@ -6,12 +6,20 @@ install.packages(c("devtools", "getPass"))
 
 Then, the ASPREE package itself can be installed using the following command:
 ```
+username <- "your_monash_username"
 devtools::install_git("https://gitlab.erc.monash.edu.au/aspree/aspree-r-package.git",
-    credentials = git2r::cred_user_pass(readline(prompt="USERNAME: "),
-    getPass::getPass()))
+    credentials = git2r::cred_user_pass(username, getPass::getPass()))
 ```
 You will be prompted for your Monash GitLab credentials before installation proceeds.
 
+Here's an example using the ASPREE library to retrieve ASPREE XT consent status:
+```
+library(aspree)
+library(dplyr)
+
+aspreeConsent <- aspreeDb("ASPREE Data Snapshot") %>% getXTConsent()
+```
+
 # Development
 
 Recommended reading: [the devtools cheatsheet](https://www.rstudio.com/wp-content/uploads/2015/03/devtools-cheatsheet.pdf)