Merge pull request 'docs:update readme' (#1) from docs/update-readme into master

Reviewed-on: https://git.trustie.net/openatom_foundation/bitxhub/pulls/1

README.md

@@ -11,22 +11,48 @@ reference implementation, that can provide reliable technical support for the fo
 of a blockchain internet and intercommunication of value islands.
 
 
-## Quick start
-
-See [Quick start](https://github.com/meshplus/bitxhub/wiki/Quick-start) in the wiki.
-
 
 ## Architecture
 
-<p>
-    <img src="https://raw.githubusercontent.com/meshplus/bitxhub/master/docs/arch.png" />
-</p>
 
-The diagram above shows the overall architecture and basic interchain processing workflow of BitXHub. BitXHub consists of relay-chain, Pier (interchain gateway) and app-chain, which is a service platform to handle the interaction among cross-layer heterogeneous chains.
+![](docs/docs/assets/bitxhub-arch.png)
+
+
+The diagram above shows the overall architecture which is a service platform to handle the interaction among cross-layer heterogeneous chains.
 
 For more details please visit our [whitepaper](https://upload.hyperchain.cn/BitXHub%20Whitepaper.pdf) | [白皮书](https://upload.hyperchain.cn/BitXHub%E7%99%BD%E7%9A%AE%E4%B9%A6.pdf).
 
+# Start BitXHub
+Requirements
+- OS Support: Linux and Mac OS
+- Go 1.13.x or later
+- Tmux
+- Git
 
+BitXHub start script relies on [golang](https://golang.org/) and [tmux](https://github.com/tmux/tmux/wiki). Please
+install the software before start.
+
+Use commands below to clone the project:
+
+```shell
+git clone https://git.trustie.net/openatom_foundation/bitxhub.git
+```
+
+BitXHub also relies on some small tools, use commands below to install:
+
+```shell
+cd bitxhub
+bash scripts/prepare.sh 
+git checkout -f v1.0.0-rc1
+```
+
+Finally, run the following commands to start a four nodes relay-chain.
+
+```shell
+make cluster
+```
+
+**Noting:** `make cluster` will use `tmux` to split the screen. Thus, during commands processing, better not switch the terminal.
 
 ## Usage