add image.

Author: michelp

AdjacencyMatrixBFS.png

@@ -1,8 +1,10 @@
-# Goals and premises
+# Welcome to the GraphBLAS Forum
 
 The GraphBLAS Forum is an open effort to define standard building
 blocks for graph algorithms in the language of linear algebra.
 
+# Goals and premises
+
 We believe that the state of the art in constructing a large
 collection of graph algorithms in terms of linear algebraic operations
 is mature enough to support the emergence of a standard set of
@@ -20,6 +22,8 @@ pair of scalar operations involved in the linear algebra computations
 to define a semiring, we can extend the range of these primitives to
 support a wide range of parallel graph algorithms.
 
+![An example graph and adjacency matrix](./AdjacencyMatrixBFS.png)
+
 # More information
 
 The C reference implementation is