add Geant namespace

src/HEP/Geant/ActionInitialization.hh

@@ -3,6 +3,9 @@
 
 #include "G4VUserActionInitialization.hh"
 
+namespace uLib {
+namespace Geant {
+
 class ActionInitialization : public G4VUserActionInitialization {
 public:
   ActionInitialization();
@@ -15,4 +18,7 @@ public:
   virtual void Build() const;
 };
 
+} // namespace Geant
+} // namespace uLib
+
 #endif