Add viem example to linea_estimateGas reference (#772)

* Add viem example

* Fix indentation

docs/developers/reference/api/linea-estimategas.mdx

@@ -104,6 +104,33 @@ You can also call the API using [Infura's supported Linea endpoints](https://doc
   console.log(fees);
   ``` 
   </TabItem>
+  <TabItem value="viem">
+  ```javascript
+  import { createPublicClient, http, parseEther } from 'viem'
+  import { linea } from 'viem/chains'
+  import { estimateGas } from 'viem/linea'
+
+  async function EstimateGas() {
+    const client = createPublicClient({
+      chain: linea,
+      transport: http(),
+    });
+
+    try {
+      const gasEstimate = await estimateGas(client, {
+        account: '0x...', // Source account's address
+        to: '0x...', // Destination account's address
+        value: parseEther('0.004') // Amount of ETH to transfer
+      });
+      console.log('Gas Estimate:', gasEstimate);
+    } catch (error) {
+      console.error('Error estimating gas:', error);
+    }
+  }
+
+  EstimateGas();
+  ```
+  </TabItem>
 </Tabs>
 
 ### Response