INitial commit of CAC code

docs/Commands/boundary.md

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+# boundary
+
+```sh
+boundary xyz
+```
+
+## Inputs
+
+`xyz` - string describing the boundary conditions in which `x`, `y`, and `z` can have values of either `p` for periodic or `s` for shrink-wrapped.
+
+## Examples
+
+```sh
+boundary ppp
+boundary sps
+```
+
+## Description 
+
+Boundary sets the boundary conditions of the model being either periodic or shrink-wrapped. 
+Because boundary data is included within the restart file format, this command is not strictly required.
+If included this command will override the boundary conditions defined within the data file.