Add nshm

src/hazard/src/main/java/gov/usgs/earthquake/nshmp/netcdf/NetcdfHazardCurves.java

@@ -23,8 +23,18 @@ import ucar.nc2.dataset.NetcdfDatasets;
  */
 public class NetcdfHazardCurves extends Netcdf<StaticDataHazardCurves> {
 
+  private final Nshm nshm;
+
   public NetcdfHazardCurves(Path netcdfPath) {
     super(netcdfPath);
+    nshm = Nshm.valueOf(netcdfData().scienceBaseMetadata().catalogId);
+  }
+
+  /**
+   * Returns the NSHM
+   */
+  public Nshm nshm() {
+    return nshm;
   }
 
   @Override