create_adjacency_matrix: Create a binary adjacency matrix from a distance matrix.
In jaspercooper/distancematrix:

Create a binary adjacency matrix from a distance matrix.

1	create_adjacency_matrix(distance_matrix, threshold, zero_diagonal = T, ...)

`distance_matrix`	A distance matrix (see create_distance_matrix()).
`threshold`	The minimum distance one unit should be from another (expressed in same units as distance matrix)
`zero_diagonal`	A logical argument indicating whether the diagonal of the adjacency matrix should be all 0's, such that a unit is not defined as adjacent to itself.