Update README.md

README.md

@@ -39,6 +39,56 @@ Yorkie is a framework for building collaborative editing applications.
  - JS SDK: https://github.com/yorkie-team/yorkie-js-sdk
  - Go Client: https://github.com/yorkie-team/yorkie/tree/master/client
 
+## Quick Start
+
+For now, we didn't deploy binary yet. So you should [compile Yorkie yourself](#developing-yorkie).
+
+Yorkie uses MongoDB to store it's data. To start MongoDB, type `docker-compose up`.
+
+Next, let's start a Yorkie agent. Agent runs until they're told to quit and handle the communication of maintenance tasks of Agent. and start the agent:
+
+```
+$ ./bin/yorkie agent
+```
+
+Use the -c option to change settings such as the MongoDB connectionURI.
+
+```
+$ ./bin/yorkie agent -c yorkie.json
+```
+
+The configuration file with default values ​​is shown below.
+
+```
+# yorkie.json
+{
+   "RPCPort":9090,
+   "Mongo":{
+      "ConnectionURI":"mongodb://mongo:27017",
+      "ConnectionTimeoutSec":5,
+      "PingTimeoutSec":5,
+      "YorkieDatabase":"yorkie-meta"
+   }
+}
+```
+
+## Developing Yorkie
+
+For building Yorkie, You'll first need [Go](https://golang.org) installed (version 1.13+ is required). Make sure you have Go properly [installed](https://golang.org/doc/install), including setting up your [GOPATH](https://golang.org/doc/code.html#GOPATH).
+
+Next, clone this repository into some local directory and then just type `make build`. In a few moments, you'll have a working `yorkie` executable:
+```
+$ make
+...
+$ bin/yorkie
+```
+
+Tests can be run by typing `make test`.
+
+*NOTE: `make test` includes integration tests that require a local MongoDB listen on port 27017. To start MongoDB, type `docker-compose up`.*
+
+If you make any changes to the code, run `make fmt` in order to automatically format the code according to Go [standards](https://golang.org/doc/effective_go.html#formatting).
+
 ## Internals
 
  - Yorkie is based on [ H.-G. Roh, M. Jeon, J.-S. Kim, and J. Lee, “Replicated abstract