add fuel example (#10)

* initialize fuel example

* update gitignore

* add get_price and update_price_feeds

* update

* refactor

* update deps version

* fix

* address comments

Author: cctdaniel

price_feeds/fuel/fetch-and-update-btc-price/.env.example

@@ -0,0 +1,7 @@
+NEXT_PUBLIC_HAS_CONTRACT=true
+NEXT_PUBLIC_HAS_PREDICATE=true
+NEXT_PUBLIC_HAS_SCRIPT=true
+NEXT_PUBLIC_DAPP_ENVIRONMENT=testnet
+NEXT_PUBLIC_TESTNET_CONTRACT_ID=0x3e2f83f9bb6dd9bafc3e58bf40f091f3cc1304bd025a2fc70f0e6b2632a46799
+NEXT_PUBLIC_PYTH_TESTNET_CONTRACT_ID=0x1ab91bc1402a187055d3e827017ace566a103ce2a4126517da5d656d6a436aea
+NEXT_PUBLIC_HERMES_BTC_URL="https://hermes.pyth.network/v2/updates/price/latest?ids[]="

price_feeds/fuel/fetch-and-update-btc-price/.eslintignore

@@ -0,0 +1 @@
+src/sway-api

price_feeds/fuel/fetch-and-update-btc-price/.eslintrc.json

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+{
+  "extends": "next/core-web-vitals",
+  "ignoreDuringBuilds": true
+}

price_feeds/fuel/fetch-and-update-btc-price/.gitignore

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+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+.yarn/install-state.gz
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts
+
+.fuels
+
+src/sway-api/contracts
+src/sway-api/predicates
+src/sway-api/scripts
+src/sway-api/index.ts
+
+sway-programs/**/out
+.turbo
+
+# MacOS
+.DS_Store

price_feeds/fuel/fetch-and-update-btc-price/README.md

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+# Fetch and Update BTC Price Example
+
+This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-fuels`](https://github.com/FuelLabs/fuels-ts/tree/master/packages/create-fuels).
+
+## Getting Started
+
+1. Copy .env.example to .env.local
+
+```bash
+cp .env.example .env.local
+```
+
+2. Start the Fuel development server. This server will start a local Fuel node and provide hot-reloading for your smart contracts.
+
+```bash
+npm run fuels:dev
+```
+
+3. Start the Next.js development server.
+
+```bash
+npm run dev
+```
+
+## Features
+
+- Connects to Fuel wallet
+- Fetches BTC/USD price from Pyth Network
+- Updates price on-chain using Pyth's price feed
+- Displays current price
+
+## Smart Contract
+
+The main contract (`UpdatePrice`) interacts with the Pyth contract to:
+
+- Get the valid time period for price updates
+- Fetch price data
+- Update price feeds
+
+You can find the contract code [here](sway-programs/contract/src/main.sw).
+
+## Deploying to Testnet
+
+To learn how to deploy your Fuel dApp to the testnet, you can follow our [Deploying to Testnet](https://docs.fuel.network/docs/fuels-ts/creating-a-fuel-dapp/deploying-a-dapp-to-testnet/) guide.
+
+## Learn More
+
+- [Fuel TS SDK docs](https://docs.fuel.network/docs/fuels-ts/)
+- [Fuel Docs Portal](https://docs.fuel.network/)

price_feeds/fuel/fetch-and-update-btc-price/fuels.config.ts

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+import { createConfig } from 'fuels';
+import dotenv from 'dotenv';
+
+dotenv.config({
+  path: ['.env.local', '.env'],
+});
+
+export default createConfig({
+  contracts: ['./sway-programs/contract'],
+  output: './src/sway-api',
+  providerUrl: 'https://testnet.fuel.network/v1/graphql',
+  privateKey: process.env.PRIVATE_KEY,
+  forcBuildFlags: ['--release'],
+});

price_feeds/fuel/fetch-and-update-btc-price/next.config.js

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+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  reactStrictMode: true,
+};
+
+module.exports = nextConfig;