code: @Nonnull
    public CSP2SourceList addHost (@Nonnull @Nonempty final String sHost)
    {
      ValueEnforcer.notEmpty (sHost, "Host");
      m_aList.add (sHost);
      return this;
    }
docs: Add a host
  
  @param sHost
  Host to add. Must be a valid URL or a star prefixed version.
  @return this