WebClient: Create tutorial "How to create notes with custom logic"

Here we can almost copy the Rust client tutorial one by one (https://0xmiden.github.io/miden-docs/imported/miden-tutorials/src/rust-client/custom_note_how_to.html).I think it is ok to create two clients in the browser.

The only question is, is this how people would use the WebClient? Wouldn't I want to use this custom note and send and receive the assets in my wallet?

The task is to adapt an existing Rust client tutorial (https://0xmiden.github.io/miden-docs/imported/miden-tutorials/src/rust-client/custom_note_how_to.html) for the WebClient. Start by reviewing the Rust tutorial to understand the custom note creation logic. Then, examine the WebClient codebase to see how similar browser-based clients are structured. The goal is to create a tutorial that shows how to create notes with custom logic in the browser, possibly involving two clients and asset handling in a wallet.

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