Merge pull request #5 from AElfProject/feat/getting-started_overview

Adding Overview pages

docs/getting started/overview.md

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+# Developer Documentation Overview
+
+This document provides guidelines, documents, and API references for developers building DApps on aelf blockchain.
+
+## Introduction to aelf
+
+aelf is a comprehensive solution for Web3 DApps, offering a cloud-native, high-performance blockchain system. It supports DeFi and Metaverse applications, providing a secure, fast, and cost-efficient environment.
+
+## Key Features
+
+- Cloud-native architecture
+- High performance and scalability
+- Security and cross-chain capabilities
+- Developer-friendly tools and infrastructure
+
+## Whitepapers
+
+- [aelf Whitepaper](https://aelf.com/gridcn/aelf_whitepaper_v1.7_en.pdf)
+- [Economic and Governance Whitepaper](https://aelf.com/gridcn/aelf_Economic_and_Governance_Whitepaper_v1.2_en.pdf)
+
+## Why Choose aelf?
+
+aelf offers:
+
+- High-speed smart contract execution
+- MainChain and multi-SideChains architecture for scalability
+- Cross-chain data interaction
+- Cost-effective development and usage
+
+For detailed technical information, refer to the whitepapers linked above.