Warn of problem with scripted theme installation

Author: DesiQuintans

README.Rmd

@@ -36,6 +36,8 @@ Pebble-Safe is a colourblind-friendly theme for RStudio 1.2.x. It comes in Light
 
 5. Click _Apply_ to apply the theme.
 
+**NOTE:** The `rstudioapi::addTheme()` function does not currently work for this theme. You need to manually install Pebble-Safe with the above steps.
+
 
 
 ## Colourblind-friendly palettes

README.md

@@ -43,6 +43,10 @@ Hack in 10 pt <https://sourcefoundry.org/hack>.
 
 5.  Click *Apply* to apply the theme.
 
+**NOTE:** The `rstudioapi::addTheme()` function does not currently work
+for this theme. You need to manually install Pebble-Safe with the above
+steps.
+
 ## Colourblind-friendly palettes
 
 Choosing colours for syntax highlight has a few extra difficulties: