%  Generating a Givens' (2x2) matrix T such that
%            T*v = [d; 0] 
%
%   Input:  v -- a vector of dimension 2 
%
%  Output:  T -- Givens' matrix 
%           d -- the 2-norm of v 
%
%  syntax  >> [T,d] = GivensMatrix(v)
