Orch-dapp-contracts: auto-stake-it

[Jovonni]

Integrate auto-stake-it.contract.js, and auto-stake-it.flows.js into dapp-orchestration-basics:

contract:
https://github.com/Agoric/agoric-sdk/blob/master/packages/orchestration/src/examples/auto-stake-it.contract.js

flows:
https://github.com/Agoric/agoric-sdk/blob/master/packages/orchestration/src/examples/auto-stake-it.flows.js