Merge pull request #75 from Branham2/patch-1

Create read_bond_neighbors.md

Author: pkawak

Manual/read_bond_neighbors.md

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+<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>`