WIP: Add ZDC into simple_topside Configuration

Added detector and readout configuration of ZDC into simple_topside.

src/ConceptDetectors/topside/compact/materials.xml

@@ -169,4 +169,9 @@
     <D value="0.186" unit="g / cm3"/>
     <fraction n="1.0" ref="SiliconCarbide"/>
   </material>
+  <material name="PlasticScint">
+    <D type="density" unit="g/cm3" value="1.032"/>
+    <composite n="9" ref="C"/>
+    <composite n="10" ref="H"/>
+  </material>
 </materials>