docs(common): updates documentation (#287)

Author: PacificYield

docs/solidity-guides/solidity-overview.md

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-Add an overview for this tab
-Example: https://docs.starknet.io/
+# Quick Start
+
+This tutorial guides you to start quickly with Zama’s **Fully Homomorphic Encryption (FHE)** technology for building confidential smart contracts. 
+
+## What You’ll Learn
+
+In about 20 minutes, you will:
+
+- Build your first **confidential ERC20** contract that leverages FHE.
+- Deploy the contract on the **Sepolia** Network.
+- **Mint tokens** and **perform transactions** in FHE.
+- Build a **frontend application** for your contract.
+
+## Prerequisite
+
+- A basic understanding of **Solidity** library and **Ethereum**.
+- A certain amount of **Sepolia ETH** available.
+  -  If you don’t have enough ETH, use a Sepolia faucet to request free SepoliaETH for testing such as [Alchemy Faucet](https://www.alchemy.com/faucets/ethereum-sepolia) or [QuickNode Faucet](https://faucet.quicknode.com/ethereum/sepolia).
+
+## What is Confidential ERC20
+
+The contract that you will build with this tutorial is called `ConfidentialERC20Mintable` — a privacy-preserving ERC20 implementation that leverages **FHE** to keep balances and transactions confidential. To understand this contract, let’s first introduce the foundational concepts.
+
+**ERC20**
+
+ERC20 is a widely used token standard on Ethereum that defines a set of rules for creating and managing fungible tokens. These tokens are efficient but lack privacy — balances and transactions are visible to anyone on the blockchain.
+
+**Confidential ERC20**
+
+Zama’s `ConfidentialERC20` introduces privacy to ERC20 tokens by storing balances and transactions in an encrypted format using FHE.
+
+The `ConfidentialERC20` contract still supports standard ERC20 functions such as `transfer`, `approve`, `transferFrom`, `balanceOf`, and `totalSupply` but ensures these operations are processed securely with encrypted data.
+
+To explore the implementation details of ConfidentialERC20, check out the [Zama blog post](https://www.zama.ai/post/confidential-erc-20-tokens-using-homomorphic-encryption).
+
+**Confidential ERC-20 Mintable**
+
+The contract that we will build in this tutorial is `ConfidentialERC20Mintable` . It's built on top of `ConfidentialERC20` by adding secure minting capabilities. This allows authorized accounts to create new tokens, while maintaining the privacy guarantees of encrypted balances and transactions.
+
+The `ConfidentialERC20Mintable` contract ensures:
+
+- **Enhanced privacy**: Balances are stored as encrypted values (`euint64`), preventing public inspection of account balances.
+- **Secure transactions**: Token transfers are processed securely, maintaining confidentiality of amounts.
+- **Owner visibility**: Only account owners can decrypt and view their balances.
+
+## Next steps
+
+Choose your path and get started:
+
+- [**Hardhat Guide**](hardhat) – Full-fledged development environment, suitable for **production**.