update readme.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

README.md

@@ -1,9 +1,48 @@
 # Gopush
 
-A push notification server written in Go (Golang).
+A push notification server using [Gin](https://github.com/gin-gonic/gin) framework written in Go (Golang).
 
 [![Build Status](https://travis-ci.org/appleboy/gofight.svg?branch=master)](https://travis-ci.org/appleboy/gofight) [![Coverage Status](https://coveralls.io/repos/github/appleboy/gopush/badge.svg?branch=master)](https://coveralls.io/github/appleboy/gopush?branch=master) [![Go Report Card](https://goreportcard.com/badge/github.com/appleboy/gopush)](https://goreportcard.com/report/github.com/appleboy/gopush) [![codebeat badge](https://codebeat.co/badges/ee01d852-b5e8-465a-ad93-631d738818ff)](https://codebeat.co/projects/github-com-appleboy-gopush)
 
+## Feature
+
+* Support [Google Cloud Message](https://developers.google.com/cloud-messaging/) using [go-gcm](https://github.com/google/go-gcm) library for Android.
+* Support [HTTP/2](https://http2.github.io/) Apple Push Notification Service using [apns2](https://github.com/sideshow/apns2) library.
+* Support [YAML](https://github.com/go-yaml/yaml) configuration.
+
+See the [YAML config eample](config/config.yaml):
+
+```yaml
+core:
+  port: "8088"
+  notification_max: 100
+  mode: "release"
+  ssl: false
+  cert_path: "cert.pem"
+  key_path: "key.pem"
+
+api:
+  push_uri: "/api/push"
+  stat_go_uri: "/api/status"
+
+android:
+  enabled: false
+  apikey: ""
+
+ios:
+  enabled: false
+  pem_cert_path: "cert.pem"
+  pem_key_path: "key.pem"
+  production: false
+
+log:
+  format: "string" # string or json
+  access_log: "stdout"
+  access_level: "debug"
+  error_log: "stderr"
+  error_level: "error"
+```
+
 ## License
 
 Copyright 2016 Bo-Yi Wu [@appleboy](https://twitter.com/appleboy).

config/config.yaml

@@ -21,6 +21,7 @@ ios:
   production: false
 
 log:
+  format: "string" # string or json
   access_log: "stdout"
   access_level: "debug"
   error_log: "stderr"