Step to add Aura session keys is missing from Cumulus tutorial

[ltfschoen]

Content request

It is necessary to generate and add the Aura key in to the Keystore when connecting a parachain that has been registered on Rococo relay chain in order for blocks to be produced after providing the WASM and genesis state files, otherwise it may revert to Alice, so changes may be made to the code to accept Key command as shown here https://github.com/DataHighway-DHX/DataHighway-Parachain/pull/11/files. This was not mentioned in the parachain documentation https://docs.substrate.io/tutorials/v3/cumulus/rococo/, nor the official parachain template https://github.com/substrate-developer-hub/substrate-parachain-template/blob/main/node/src/cli.rs#L7

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