INitial commit of CAC code

docs/Commands/neighbor.md

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+# neighbor
+
+```sh
+neighbor skin
+```
+
+## Inputs
+
+`skin` - The skin distance in angstrom added to the cutoff radius for construction of verlet lists.
+
+## Examples
+
+```sh
+neighbor 1.5
+```
+
+## Description
+
+This command specifies the additional skin distance which is used when constructing the verlet neighbor lists.
+When an atom has moved greater than the half of the skin distance, then the neighbor lists are reconstructed.
+