add info about Seth to verification docs (#1643)

Author: Tofel

book/src/framework/verify.md

@@ -1,5 +1,7 @@
 # Verifying Contracts
 
+## Using Foundry
+
 You need to install [Foundry](https://book.getfoundry.sh/getting-started/installation) first, `forge` should be available in your `$PATH`.
 
 Check out our [example](https://github.com/smartcontractkit/chainlink-testing-framework/blob/main/framework/examples/myproject/verify_test.go) of programmatically verifying contracts using `Blockscout` and `Foundry`. You'll need to provide:
@@ -17,3 +19,42 @@ Check out our [example](https://github.com/smartcontractkit/chainlink-testing-fr
 		)
 		require.NoError(t, err)
 ```
+
+## Using Seth
+
+If you don't want to verify contracts or you can't or don't want to use `Blockscout` not all is lost.
+
+### With CLI
+
+You can use `Seth` to trace your transaction both from your Go code or from [the CLI](https://smartcontractkit.github.io/chainlink-testing-framework/libs/seth.html#single-transaction-tracing). Remember that you need to adjust `seth.toml` to point to gethwrappers or ABIs of contracts you want to trace.
+
+### Programatic
+
+If you want to use from Go code, you need to have a couple of things in mind:
+* you need to point Seth to your Gethwrappers, so that it can extract ABIs from them
+* you need to decide, when it should trace transactions: reverted, none or all (by default, only reverted ones are traced)
+* you need to decide, where to output tracing results: console, dot graphs, json files (be default, to console)
+
+If printing to console remember to set `Seth` log level to `debug`, otherwise you won't see anything relevant printed:
+```
+```
+
+
+
+```go
+client, err := NewClientBuilder().
+    WithNetworkName("my network").
+    WithRpcUrl("ws://localhost:8546").
+    WithPrivateKeys([]string{"ac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80"}).
+    // tracing
+    WithTracing(seth.TracingLevel_All, []string{seth.TraceOutput_Console}).
+    // folder with gethwrappers for ABI decoding
+    WithGethWrappersFolders([]string{"./gethwrappers/ccip", "./gethwrappers/keystone"}).
+    Build()
+
+if err != nil {
+    log.Fatal(err)
+}
+```
+
+For more information about configuring `Seth` please read about [TOML config](https://smartcontractkit.github.io/chainlink-testing-framework/libs/seth.html#toml-configuration) and [programatic builder](https://smartcontractkit.github.io/chainlink-testing-framework/libs/seth.html#config).