Create read_bond_neighbors.md

Added documentation for read_bond_neighbors

Author: Branham2

Manual/read_bond_neighbors.md

@@ -0,0 +1,5 @@
+<h1>read_bond_neighbors</h1>
+
+Creates a neighbor list from an existing list of bonds. The syntax is as follows.
+
+`read_bond_neighbors <name of new neighbor list> <name of bond input file>`