Hello and Echo Contracts

[fadeev]

Depends on https://github.com/zeta-chain/example-contracts/pull/201

Summary by CodeRabbit

• New Features
  • Expanded tutorial on creating a universal app contract, enhancing clarity and detail.
  • Added new functions for contract calls and token withdrawals with gas fee management.
• Updates
  • Increased read time for the "First Universal App on Localnet" tutorial from 10 minutes to 30 minutes.
  • Revised prerequisites and descriptions to improve instructional quality and consistency.

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Name	Status	Preview	Comments	Updated (UTC)
docs-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 8, 2024 9:22am

[coderabbitai[bot]]

📝 Walkthrough

📝 Walkthrough

## Walkthrough The pull request introduces modifications to the tutorial documentation and related contract code. Specifically, the `readTime` for the "First Universal App on Localnet" tutorial is updated from "10 min" to "30 min" in the `_meta.json` file. Additionally, the `hello.mdx` tutorial is revised to enhance clarity, expand prerequisites, and update the contract's implementation details. Changes include the introduction of new functions in the `Hello` contract and adjustments to the contract's state variable declaration, ensuring improved instructional quality. ## Changes | File Path | Change Summary | |------------------------------------------------|-----------------------------------------------------------------------------------------------------| | `src/pages/developers/tutorials/_meta.json` | Updated `readTime` for "First Universal App on Localnet" tutorial from "10 min" to "30 min". | | `src/pages/developers/tutorials/hello.mdx` | Revised introduction, expanded prerequisites, updated contract description, and added new functions (`call`, `withdrawAndCall`). Modified `gateway` to be immutable and updated event messages for clarity. | ## Possibly related PRs - **#393**: Adjusts the `readTime` for the "Swap Any Token" tutorial in `_meta.json`, similar to the change made in this PR. - **#443**: Introduces a new entry for "localnet" in `_meta.json`, specifying a `readTime` of "30 min," aligning with this PR's changes. - **#470**: Updates the Hello tutorial to incorporate gateway and localnet features, relating to changes in this PR. ## Suggested reviewers - **bbbeeeee** - **brewmaster012** - **andresaiello**

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[fadeev]

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[fadeev]

@bbbeeeee @zeta-chain/fullstack @brewmaster012 please, review.