Added CRAN links to README.

Author: benjaminjack

README.md

@@ -6,20 +6,22 @@ Currently, the ParseMSF package provides functions for parsing Thermo MSF files
 
 # Installation
 
-This package is currently under development and can be installed from Github by running the following command in the R console:
+This latest stable release of this package can be installed from [CRAN](https://cran.r-project.org/package=parsemsf) by running the following command in the R console:
 
 ```
-devtools::install_github("benjaminjack/parsemsf")
+install.packages("parsemsf")
 ```
 
-# Usage
-
-To get an introduction to the functions in ParseMSF, please run the following command to see the Introduction vignette (after installing the package):
+If you want to install the development version this package from Github by running the following command in the R console:
 
 ```
-vignette(introduction, package="parsemsf")
+devtools::install_github("benjaminjack/parsemsf")
 ```
 
+# Usage
+
+To get an introduction to the functions in ParseMSF, please see the [Introduction vignette on CRAN](https://cran.r-project.org/package=parsemsf).
+
 # Acknowledgements
 
 Some of the SQL queries in this package come from the now-defunct [paRseMSF package](https://github.com/ashokapol/parsemsf) by Ashoka Polpitiya.