simplify README, redirect to dubbo.io

README.md

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-Dubbo is a distributed, high performance RPC framework which empowers applications with service import/export capabilities.
-
-It contains three key parts, which include:
-
-* **Remoting**: a network communication framework providing sync-over-async and request-response messaging.
-* **Clustering**: a remote procedure call abstraction with load-balancing/failover/clustering capabilities.
-* **Registration**: a service directory framework for service registration and service event publish/subscription
-
-For more details, please refer to [dubbo.io](http://dubbo.io).
-
-## Documentation
-
-* [User's Guide](http://dubbo.io/user-guide/)
-* [Developer's Guide](http://dubbo.io/developer-guide/)
-* [Admin's Guide](http://dubbo.io/admin-guide/)
-
-## Quick Start
-This guide gets you started with dubbo with a simple working example.
-#### Download the sources(examples)
-You’ll need a local copy of the example code to work through this quickstart. Download the demo code from our [Github repository](https://github.com/alibaba/dubbo) (the following command clones the entire repository, but you just need the `dubbo-demo` for this quickstart and other tutorials):
-
-```sh
-$ cd ~
-$ # Clone the repository to get the source code.
-$ git clone https://github.com/alibaba/dubbo.git dubbo
-$ git checkout master
-$ # or: git checkout -b dubbo-2.4.x
-```
-#### Build & Run
-1. Build the whole sources use the following maven command
-
-```sh
-$ cd ~/dubbo
-$ mvn clean install -Dmaven.test.skip
-$ # The demo code for this quickstart all stay in the `dubbo-demo` folder
-$ cd ./dubbo-demo
-$ ls
-```
-2. Run demo-provider. Start the provider and export service  
-```sh
-$ # Navigate to the provider part
-$ cd ~/dubbo/dubbo-demo/dubbo-demo-provider/target
-$ # unpack
-$ tar zxvf dubbo-demo-provider-2.5.4-SNAPSHOT-assembly.tar.gz
-$ cd dubbo-demo-provider-2.5.4-SNAPSHOT/bin
-$ ls
-```
-
-```sh
-$ # Start the provider
-$ ./start.sh
-```
-3. Run demo-consumer. Start the consumer and consume service provided by _the provider_ above
-
-```sh
-$ # Navigate to the consumer part
-$ cd ~/dubbo/dubbo-demo/dubbo-demo-consumer/target
-$ # unpack
-$ tar zxvf dubbo-demo-consumer-2.5.4-SNAPSHOT-assembly.tar.gz
-$ cd dubbo-demo-consumer-2.5.4-SNAPSHOT/bin
-$ ls
-```
-
-```sh
-$ ./start.sh
-```
-For a more detailed tutorial of this demo, click [here](http://dubbo.io/#quickstart)
-
-## Getting Help
-* Community
-* Releases
-* Contributors
-* Q&A
-
-
+Pls. visit [dubbo.io](http://dubbo.io) for more information.
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