draft WG charter for review

Following the discussion in Sunnyvale, I have created a first draft for the charter for the proposed web of things framework working group and invite your comments, either as pull requests or email to this list with the prefix [WG Charter]

  https://github.com/w3c/wot/blob/master/WG/charter.md

In particular, the current draft excludes work on encodings and APIs, but cites a dependency on the EXI WG. I have included an initial list of other relevant W3C groups and groups outside of W3C.

When considering additional work items, please think about whether they would be a good for this working group or better suited to another working group.

—
   Dave Raggett <dsr@w3.org <mailto:dsr@w3.org>>