Add gas estimation guide

[nwakaku]

Cedra Builders Forge - Submission

Season 1

📋 Task Information

Task Title: Create Any Technical Guide for Cedra

Issue Link: #62

Telegram: @Wizzy2304

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✅ Checklist

• Commented "I'm taking this task" on the issue before starting
• This PR contains ONE task only
• All work is original (no copy-paste)
• Code compiles without errors and all tests pass
• Includes README, tests, and documentation
• Will share PR in Cedra Builders Telegram

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📝 What Was Built

Added a guide: "How to Estimate Gas Before Transactions" in guides/How to estimate gas before transactions.md. The guide covers:

• Gas basics: gas units, gas price, and total cost calculation
• Basic gas estimation using transaction.simulate.simple() with TypeScript examples
• Common pitfalls (4):
  1. Not checking the success flag
  2. Not accounting for transaction amount
  3. Using stale estimates
  4. Not handling simulation errors
• Best practices: 5 recommendations for reliable gas estimation

The guide is concise (~487 words) and focuses on essential information for developers.

Task Issue

[Link to task issue]

Testing Instructions

1. Review the guide:

   cat guides/"How to estimate gas before transactions.md"

2. Verify code examples:

   • Ensure TypeScript examples use correct SDK imports
   • Check that function signatures match the Cedra TypeScript SDK API
   • Verify gas estimation logic is accurate

3. Test with a real transaction (optional):

   # Navigate to any example project
   cd first-tx
   
   # Run the example and verify gas estimation works
   npm install
   npm run start

4. Validate markdown formatting:

   • Check that code blocks render correctly
   • Verify links to external resources work
   • Ensure the guide is readable and well-structured

Dependencies or Setup Required

• None. The guide is documentation only and requires no additional setup.
• For testing code examples:
  • Node.js and npm
  • @cedra-labs/ts-sdk package
  • Access to Cedra testnet or mainnet
  • A funded Cedra account for testing transactions