In order to make an `sdk.Msg` understandable by rosetta the only thing which is required is adding the methods to your message that satisfy the `rosetta.Msg` interface.
Examples on how to do so can be found in the staking types such as `MsgDelegate`, or in bank types such as `MsgSend`.
Since rosetta requires to provide 'returned' errors to network options. In order to declare a new rosetta error, we use the `errors` package in cosmos-rosetta-gateway.
var CustomError = crgerrs.RegisterError(100, "custom message", customErrRetriable, "description")
```
Note: errors must be registered before cosmos-rosetta-gateway's `Server`.`Start` method is called. Otherwise the registration will be ignored. Errors with same code will be ignored too.
NOTE: when using a customized client, the command cannot be used as the constructors required **may** differ, so it's required to create a new one. We intend to provide a way to init a customized client without writing extra code in the future.