Update accessibility links.

CONTRIBUTING.md

@@ -15,6 +15,11 @@ Every contribution has to come with:
 * Before starting coding, **you must open an issue** and start discussing with the community to see if the idea/feature is interesting enough.
 * A documentation page in the [documentation folder](https://github.com/Microsoft/WindowsTemplateStudio/tree/master/docs).
 * Unit tests (If applicable)
+
+* If you've changed the UI: 
+  - Be sure you are including screenshots to show the changes
+  - Be sure you have reviewed the [accesibility checklist](accessibility.md)
+
 * You tested your code with two most recent Windows 10 SDKs. (Build 14393 and 15063)
 * PR has to target dev branch
 

docs/getting-started-developers.md

@@ -51,6 +51,10 @@ Using this solution while authoring templates or improving the Wizard have the f
 
 So we encourage to use this solution for the general template authoring or code development and, once you are done, make some final local tests using the Installer.sln or Big.sln solution.
 
+### Accesible UI
+
+Both the UI and the templates (generated code) must be accesible by definition. If you are going to collaborate in this space, please, be sure you have verified all accesibility rules defined in [Accessibility checklist](accesibility.md).
+
 ## Inside the Code folder
 
 Following are described the contents for each folder: