Proposal for Requirements - Introductory paragraph on Scope

Github and I are not getting along today, and I fear that this proposal 
won't be available in Github in time for the meeting.

We were asked to add a paragraph to the Introduction clarifying the 
Scope of Silver.  Here's what I propose:


      1.1 Scope

Silver will have a broader scope than WCAG 2.0 and 2.1. The Web Content 
Accessibility Guidelines (WCAG) are scoped to Web and to Content. Silver 
is being deliberately designed to be able to include:

  * *Disability Needs*: An improved measurement and conformance
    structure that includes guidance for a broad range of disabilities.
    This includes particular attention to the needs of low vision and
    cognitive accessibility, whose needs don't tend to fit the
    true/false statement success criteria of WCAG 2.x.
  * *Emerging Technologies*: Flexibility to include emerging
    technologies, such as Virtual Reality (VR) and Voice Assistants
  * *Support for the Technologies that Impact Accessibility*: Advice for
    all levels of the accessibility technology stack who wish to support
    the Silver core Guidelines including:
      o *web content*, which will be migrated from WCAG 2.x
      o *authoring tools*, such as content management systems
      o *user agents*, such as browsers, media players
      o *software and web applications*, including mobile apps
      o *assistive technologies*, such as screen readers, screen
        magnifiers, and assistants for memory, organizational, or
        simplification
      o *operating systems* and other platforms who may want advice for
        features to better support people with disabilities

The current project design does not intend to write separate 
specifications or normative requirements for the technology stack. The 
goal is to provide information that technology venders can choose to use 
to improve the accessibility of their products.