feat: add viem docs (#292)

# Description

Add basic viem documentation with link to
[viem.sh/zksync](viem.sh/zksync)

content/00.zksync-era/50.sdk/10.js/00.viem/00.index.md

@@ -0,0 +1,69 @@
+---
+title: Getting Started
+description:
+tags: ["viem", "zksync", "sdks", "zksync era sdk", "era network"]
+links:
+  - label: Viem Documentation
+    to: https://viem.sh/zksync
+    target: _blank
+---
+
+Viem provides first-class support for the ZKsync chain.
+Full `viem/zksync` documentation is available at [viem.sh/zksync](https://viem.sh/zksync).
+
+## Installation
+
+First, install the `viem` package:
+
+```bash
+npm i viem
+```
+
+## Client Setup
+
+### 1. Set up your Client & Transport
+
+Firstly, set up your [Client](https://viem.sh/docs/clients/intro) with a desired [Transport](https://viem.sh/docs/clients/intro)
+and extend it with ZKsync [EIP712 actions](https://viem.sh/zksync/client#eip712walletactions)
+
+```js
+import { createWalletClient, custom } from 'viem'
+import { zksync } from 'viem/chains'
+import { eip712WalletActions } from 'viem/zksync'
+
+const walletClient = createWalletClient({
+  chain: zksync,
+  transport: custom(window.ethereum!),
+}).extend(eip712WalletActions())
+```
+
+### 2. Use Actions
+
+Now that you have a Client set up, you can send a transaction on ZKsync using a [paymaster](/zksync-protocol/account-abstraction/paymasters)!
+
+```js
+const hash = await walletClient.sendTransaction({
+  account: '0xA0Cf798816D4b9b9866b5330EEa46a18382f251e',
+  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
+  value: 1000000000000000000n,
+  paymaster: '0xFD9aE5ebB0F6656f4b77a0E99dCbc5138d54b0BA',
+  paymasterInput: '0x123abc...'
+})
+```
+
+...and even write to contracts:
+
+```js
+const hash = await walletClient.writeContract({
+  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
+  abi: parseAbi(['function mint(uint32 tokenId) nonpayable']),
+  functionName: 'mint',
+  args: [69420],
+})
+```
+
+## Next Steps
+
+- Find full `viem/zksync` documentation with examples at [viem.sh/zksync](https://viem.sh/zksync)
+- Check out the [ZKsync SSO](/zksync-era/unique-features/zksync-sso) built on top of `viem`
+to improve UX for users of your app with just few lines of code.

content/00.zksync-era/50.sdk/10.js/00.viem/_dir.yml

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+title: Viem