Update 'README.md'

README.md

@@ -22,6 +22,32 @@ Throws error if the index is incorrect in the file.
 
 ## Public functions
 
+Returns with a vector which contains the dimension (X, Y, Z):
+
+```
+std::vector<double> GetDimension();
+```
+
+Returns with a vector which contains N (X, Y, Z):
+
+```
+std::vector<double> GetVoxel();
+```
+
+Get/Set the energy:
+
+```
+double GetEnergy();
+void SetEnergy(double);
+```
+
+Get/Set the shape:
+
+```
+double GetShape();
+void SetShape(double);
+```
+
 Returns with the material form the list by it's index (returns -1 if the index is out of range): 
 
 ```