Add repo status badge to README

Author: gaborcsardi

inst/README.Rmd

@@ -12,6 +12,7 @@ knitr::opts_chunk$set(
 
 > Praise Users
 
+[![Project Status: Active - The project has reached a stable, usable state and is being actively developed.](http://www.repostatus.org/badges/latest/active.svg)](http://www.repostatus.org/#active)
 [![Linux Build Status](https://travis-ci.org/gaborcsardi/praise.svg?branch=master)](https://travis-ci.org/gaborcsardi/praise)
 [![Windows Build status](https://ci.appveyor.com/api/projects/status/github/gaborcsardi/praise?svg=true)](https://ci.appveyor.com/project/gaborcsardi/praise)
 [![](http://www.r-pkg.org/badges/version/praise)](http://www.r-pkg.org/pkg/praise)

inst/README.md

@@ -5,6 +5,7 @@
 
 > Praise Users
 
+[![Project Status: Active - The project has reached a stable, usable state and is being actively developed.](http://www.repostatus.org/badges/latest/active.svg)](http://www.repostatus.org/#active)
 [![Linux Build Status](https://travis-ci.org/gaborcsardi/praise.svg?branch=master)](https://travis-ci.org/gaborcsardi/praise)
 [![Windows Build status](https://ci.appveyor.com/api/projects/status/github/gaborcsardi/praise?svg=true)](https://ci.appveyor.com/project/gaborcsardi/praise)
 [![](http://www.r-pkg.org/badges/version/praise)](http://www.r-pkg.org/pkg/praise)