Add comprehensive contribution guides for Base blockchain in Indonesian and English

[Copilot]

User requested guidance on contributing to the Base node repository (https://github.com/base/node) with no prior experience.

Changes

New Documentation Files

• HOW_TO_CONTRIBUTE_TO_BASE.md - Bilingual quick start guide with learning paths and resource links
• CONTRIBUTING_TO_BASE.md - Complete Indonesian tutorial (590 lines): prerequisites, workflow, examples, FAQ
• CONTRIBUTING_TO_BASE_EN.md - English equivalent with identical structure and coverage

Updated Files

• README.md - Added prominent section linking to contribution guides
• INDEX.md - Added "Contributing to Base Blockchain" section with guide references

Content Coverage

Each guide includes:

• Environment setup (Git, Go, GitHub account)
• Contribution types (documentation, bug reports, testing, code, community)
• Complete fork→clone→branch→commit→PR→merge workflow
• Commit message conventions and PR templates
• Learning resources for Git, Go, and blockchain
• Beginner tips and troubleshooting

Example Usage

Users can start with zero knowledge:

## Quick Start (Bahasa Indonesia):

1. **Fork** repository Base: https://github.com/base/node
2. **Clone** fork kamu ke komputer lokal
3. **Install** Go (golang) dan Git
4. **Buat branch** baru untuk perubahan kamu
5. **Buat perubahan** dan test dengan `go test ./...`
6. **Commit** dengan message yang jelas
7. **Push** ke fork kamu
8. **Buat Pull Request** ke repository utama

Guides target absolute beginners while providing depth for intermediate developers exploring open source and blockchain contribution.

Original prompt

https://github.com/base/node
apa kira2 yang bisa aku lakukan untuk berkontribusk ke github base? tolong dong ajari atau lakukan sesuatu aku gatau apa2

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[ismaonezain]

@copilot mana njir ga ada

[Copilot]

@copilot mana njir ga ada

Files sudah ada kok! 😊 Mereka ada di branch PR ini: copilot/contribute-to-github-base

3 files yang dibuat:

1. CONTRIBUTING_TO_BASE.md - Panduan lengkap Bahasa Indonesia (590 baris)
2. CONTRIBUTING_TO_BASE_EN.md - Complete English guide (590 baris)
3. HOW_TO_CONTRIBUTE_TO_BASE.md - Quick start guide (287 baris)

Plus 2 files yang di-update:

• README.md - Added links to the guides
• INDEX.md - Added section for Base contribution

Bisa dilihat di tab "Files changed" di PR ini, atau langsung buka di GitHub:

• https://github.com/ismaonezain/ether-trials/blob/copilot/contribute-to-github-base/CONTRIBUTING_TO_BASE.md
• https://github.com/ismaonezain/ether-trials/blob/copilot/contribute-to-github-base/HOW_TO_CONTRIBUTE_TO_BASE.md

Commit: b6aa6c3 dan 1042b73