message: doc: Improve README spelling
diff: Nervos CKB is the layer 1 of Nervos Network, a public blockchain with PoW and cell model.
  -Nervos project defines a suite of scalable and interoperable blockchain protocols. Nervos CKB uses those protocols to create a self-evolving distributed network with novel economic model, data model and more.
  +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.
  ## License
  @@ -19,9 +19,9 @@ Nervos CKB is released under the terms of the MIT license. See [COPYING](COPYING
  ## Development Process
  -This project is still in development, it's NOT in production ready status.
  +This project is still in development, and it's NOT in production-ready status.
  -The `master` branch is regularly built and tested, but is not guaranteed to be completely stable. The `develop` branch is the work branch to merge new features, it's not stable.
  +The `master` branch is regularly built and tested, however, it is not guaranteed to be completely stable; The `develop` branch is the work branch to merge new features, and it's not stable.
  The contribution workflow is described in [CONTRIBUTING.md](CONTRIBUTING.md), and security policy is described in [SECURITY.md](SECURITY.md). To propose new protocol or standard for Nervos, see [Nervos RFC](https://github.com/nervosnetwork/rfcs).
  