Update README

Author: szyn

README.md

@@ -1 +1,73 @@
-# digdag-go-client
+# digdag-go-client
+
+[![codecov](https://codecov.io/gh/szyn/digdag-go-client/branch/master/graph/badge.svg?token=XCc0ySTin2)](https://codecov.io/gh/szyn/digdag-go-client)
+[![GoDoc](https://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](https://godoc.org/github.com/szyn/digdag-go-client)
+
+## Description
+
+Digdag client library written in Go. (Unofficial)
+
+## Requirement
+
+* digdag server
+
+## Install
+
+```console
+$ go get -u github.com/szyn/digdag-go-client
+```
+
+## Usage
+
+### e.g. Get projects infomation
+
+```go
+package main
+
+import (
+	"fmt"
+
+	digdag "github.com/szyn/digdag-go-client"
+)
+
+func main() {
+	/*
+		default endpoint: http://localhost:65432
+		If you want to change endpoint, write as the following.
+		client, err := digdag.NewClient("http://hostname:5432", false)
+	*/
+	client, err := digdag.NewClient("", false)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	projects, err := client.GetProjects()
+	if err != nil {
+		fmt.Println(err)
+	}
+	for _, project := range projects {
+		fmt.Println(project.ID, project.Name)
+	}
+}
+
+```
+
+See also: [Godoc](https://godoc.org/github.com/szyn/digdag-go-client)
+
+## Contribution
+
+1. Fork it ( http://github.com/szyn/digdag-go-client )
+1. Create your feature branch ( `git checkout -b my-new-feature` )
+1. Commit your changes ( `git commit -am 'Add some feature'` )
+1. Push to the branch ( `git push origin my-new-feature` )
+1. Run test suite ( `go test ./...` ) and confirm that it passes
+1. Run gofmt ( `gofmt -s` )
+1. Create new Pull Request 😆
+
+## LICENCE
+
+[Apache License 2.0](LICENSE)
+
+## Author
+
+[szyn](https://github.com/szyn)