feat: Create a section for User Onboarding and adding Reown (#288)

# Description

This PR creates a "User Onboarding" section under the "Ecosystem"
section of ZKsync Era's docs. It also adds Reown as one of the tools
available on ZKsync Era for user onboarding.

## Linked Issues

N/A

## Additional context

N/A

---------

Co-authored-by: Igor Aleksanov <[email protected]>

content/00.zksync-era/60.ecosystem/110.user-onboarding.md

@@ -0,0 +1,42 @@
+# User Onboarding
+
+Web3 onboarding often faces challenges due to complex wallet setups, unfamiliarity with blockchain concepts, and intimidating security practices.
+
+To drive mainstream adoption, it’s crucial to offer intuitive solutions that reduce friction while maintaining security.
+
+Providing well thought out end-to-end wallet interaction flows is a key approach to make Web3 more accessible for everyday users.
+
+## Reown (prev. known as WalletConnect)
+
+**[Reown](https://reown.com/?utm_source=zksync&utm_medium=docs&utm_campaign=backlinks)** gives developers the tools to build user
+experiences that make digital ownership effortless, intuitive, and secure.
+
+Reown has two major product offerings, they are, **AppKit** and **WalletKit**.
+
+### AppKit
+
+AppKit is a powerful, free, and fully open-source SDK for developers
+looking to integrate wallet connections and other Web3 functionalities into their apps on any EVM and non-EVM chain.
+
+In just a few simple steps, you can provide your users with seamless wallet access, one-click authentication, social logins, and
+notifications—streamlining their experience while enabling advanced features like on-ramp functionality, in-app token swaps and smart accounts.
+
+### WalletKit
+
+WalletKit is a robust, open-source SDK designed to empower seamless wallet connections and interactions across any blockchain.
+
+With WalletKit, you can offer your users a simple and secure way to connect with thousands of apps, enabling features like one-click authentication,
+secure transaction signing, and streamlined wallet address verification.
+
+Its chain-agnostic design ensures effortless multi-chain support, eliminating the need for complex integrations while delivering unmatched
+connectivity and security.
+
+To summarize, **AppKit** is for **Web3 applications** and **WalletKit** is for **Web3 wallets**.
+
+You will be able to use Reown AppKit to power end-to-end wallet interactions on your Web3 app deployed on ZKsync Era.
+
+Some links to learn more about Reown:
+
+- [Website](https://reown.com/?utm_source=zksync&utm_medium=docs&utm_campaign=backlinks)
+- [Blog](https://reown.com/blog?utm_source=zksync&utm_medium=docs&utm_campaign=backlinks)
+- [Docs](https://docs.reown.com/?utm_source=zksync&utm_medium=docs&utm_campaign=backlinks)

cspell-config/cspell-blockchain.txt

@@ -60,3 +60,4 @@ Zonic
 paradigmxyz
 weth
 usdc
+Reown