update doc, phetsims/a11y-research#166

Signed-off-by: Michael Kauzmann <michael.kauzmann@colorado.edu>

README.md

@@ -44,7 +44,7 @@ requires the folder named as such to support hosting files from main.
 ## Adding components
 
 To add a new component here is a list of steps to take:
-1. Create a markdown file in the desired common code repo `doc/` directory, see sun/doc/ for example.
+1. Create a markdown file in the desired common code repo `doc/` directory, see [sun/doc/templates/MarkdownTemplate.md](https://github.com/phetsims/sun/blob/main/doc/templates/MarkDownTemplate.md) for example.
 2. Make sure to go to the parent category markdown file (likely just `sun/doc/OtherUI.md`) and add your component to that list.
 3. To retrieve sim usages of this component. Go to the constructor of your class and add a registration line that looks like: https://github.com/phetsims/sun/blob/11823335e60202b42e07e912b73635da5b0da677/js/Slider.ts#L517-L518 
 4. Binder is auto generated each night, so nothing more is needed to move your changes to production.