chore: add verification reference in foundry docs (#242)

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# Description
- Adds reference to zksync verifier option for verification via ZKsync
block explorer
<!-- Please describe what are the changes and what they are solving for
in this PR. -->

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## Additional context

content/00.build/40.tooling/30.foundry/20.getting-started.md

@@ -115,6 +115,24 @@ contract Greeter {
 forge create src/Greeter.sol:Greeter --constructor-args "Hello ZKsync" --account myKeystore --sender <KEYSTORE_ADDRESS> --rpc-url %%zk_testnet_rpc_url%% --chain %%zk_testnet_chain_id%% --zksync
 ```
 
+### Verifying Contracts with `forge`
+
+You can verify your contracts on the ZKsync block explorer using `forge` by specifying the `zksync` verifier and the appropriate `verifier-url`.
+Here's an example command:
+
+```sh
+forge create src/Greeter.sol:Greeter \
+  --constructor-args "Hello ZKsync" \
+  --account myKeystore \
+  --sender <KEYSTORE_ADDRESS> \
+  --rpc-url %%zk_testnet_rpc_url%% \
+  --chain %%zk_testnet_chain_id%% \
+  --verifier zksync \
+  --verifier-url https://explorer.sepolia.era.zksync.dev/contract_verification \
+  --verify \
+  --zksync
+```
+
 ### Deploying Factory Contracts
 
 To deploy contracts like `GreeterFactory.sol`, use the `--zk-enable-eravm-extensions` flag.