message: docs: update readme for rylai
diff: ---
  -## About Nervos CKB
  +## About CKB
  -Nervos CKB is the layer 1 of Nervos Network, a public blockchain with PoW and cell model.
  +CKB is the layer 1 of Nervos Network, a public blockchain with PoW, improved Nakamoto concensus, cell model and a new programming model for dApps.
  -Nervos project defines a suite of scalable and interoperable blockchain protocols. Nervos CKB uses those protocols to create a self-evolving distributed network with a novel economic model, data model and more.
  +[Nervos project](https://www.nervos.org) defines [a suite of scalable and interoperable blockchain protocols](https://github.com/nervosnetwork/rfcs) to create a self-evolving distributed economy, [CKB](https://github.com/nervosnetwork/rfcs/blob/master/rfcs/0002-ckb/0002-ckb.md) is among them.
  **Notice**: The ckb process will send stack trace to sentry on Rust panics.
  This is enabled by default before mainnet, which can be opted out by setting
  the option `dsn` to empty in the config file.
  +## Testnet Rylai
  +
  +CKB Testnet *Rylai* is the testing network before its mainnet launch. At this time Rylai will be **RESET** every two weeks.
  +
  +## Mainnet
  +
  +TBD.
  +
  ## License [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fnervosnetwork%2Fckb.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Fnervosnetwork%2Fckb?ref=badge_shield)
  Nervos CKB is released under the terms of the MIT license. See [COPYING](COPYING) for more information or see [https://opensource.org/licenses/MIT](https://opensource.org/licenses/MIT).
  