More advanced examples are needed

## Is your feature request related to a problem? Please describe.
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Users have requested that examples are provided that showcase more advanced features of MUSE.

From Andelka: It would be very useful if the templates were expanded to include also some representations
of the more advanced concepts, particularly related to the main principle, which is agent-based modelling. Examples going over the different attributes of agents, more complex
objectives, search rules, budget, agent population and interactions would be very useful.

## Describe the solution you'd like
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Add at least 2 further model examples need to be created, and document them in the "Customising MUSE Tutorials" section:

1) Demonstrates different decision rules (weighted sum and epsilon constraint - the latter should use an economic objective first and then refine based on environmental performance) and budget limit
2) Demonstrates agent interaction

And alter the Add an Agent example to demonstrate agent population and give one agent a very different objective and decision rule.

## Describe alternatives you've considered
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## Additional context
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Comienza leyendo la sección existente «Customising MUSE Tutorials» y el ejemplo actual «Add an Agent». Añade dos ejemplos de modelos que cubran reglas de decisión, límites de presupuesto e interacción entre agentes, actualiza «Add an Agent» para mostrar una población y objetivos variados, y documenta los tres ejemplos en la sección del tutorial.

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