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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既存の「Customising MUSE Tutorials」セクションと現在の「Add an Agent」例を読むことから始めます。意思決定ルール、予算の上限、エージェント間のインタラクションを扱う2つのモデル例を追加し、人口と多様な目的を示すように「Add an Agent」を更新して、3つすべての例をチュートリアルセクションに記載します。

索引モデルが issue の本文から書いたものです。