Building asclepias packages

see the Usage Guide. TODO not sure the best way to link to the usage guide here TODO can this link be added as an doc-level attribute?

The asclepias repository is organized using a multiple project setup. Some of the subdirectories of the repository such as hasklepias-core, hasklepias-main, etc. contain a Cabal package that we call a "project" or "sub-project".

We can choose which subset of projects to build, including theentire asclepias project, using the cabal build command as outlined in the Usage Guide.