update README

Signed-off-by: Valery Piashchynski <piashchynski.valery@gmail.com>

Author: rustatian

README.md

@@ -1,2 +1,54 @@
-# api
-RR plugins and gRPC api
+<p align="center">
+ <img src="https://user-images.githubusercontent.com/796136/50286124-6f7f3780-046f-11e9-9f45-e8fedd4f786d.png" height="75px" alt="RoadRunner">
+</p>
+<p align="center">
+ <a href="https://packagist.org/packages/spiral/roadrunner"><img src="https://poser.pugx.org/spiral/roadrunner/version"></a>
+	<a href="https://pkg.go.dev/github.com/roadrunner-server/api/v2?tab=doc"><img src="https://godoc.org/github.com/roadrunner-server/api/v2?status.svg"></a>
+	<a href="https://github.com/roadrunner-server/api/actions"><img src="https://github.com/roadrunner-server/api/workflows/Linters/badge.svg" alt=""></a>
+	<a href="https://goreportcard.com/report/github.com/roadrunner-server/api"><img src="https://goreportcard.com/badge/github.com/roadrunner-server/api"></a>
+	<a href="https://lgtm.com/projects/g/roadrunner-server/api/alerts/"><img alt="Total alerts" src="https://img.shields.io/lgtm/alerts/g/roadrunner-server/api.svg?logo=lgtm&logoWidth=18"/></a>
+	<a href="https://discord.gg/TFeEmCs"><img src="https://img.shields.io/badge/discord-chat-magenta.svg"></a>
+</p>
+
+# RoadRunner API
+
+RR API consists of 2 parts:
+
+1. Plugin interfaces.
+2. Proto API for the PHP clients, at the moment released as **V1Beta**.
+
+Plugins should depend only on this repo, but not on each other. For example:
+
+```go
+package foo
+
+import (
+    "github.com/roadrunner-server/api/v2/plugins/config"
+)
+
+type Plugin struct {}
+
+func (p *Plugin) Init(cfg config.Configurer) error {
+	return nil
+}
+```
+
+Here as you see, our `package foo` depends only on the `api` repository, thus you can easily switch between implementations.
+
+---
+
+Proto API used for the external integrations for the RPC (mostly) or as the internal communications. For example:
+
+```go
+package foo
+
+import (
+	jobsv1beta "github.com/roadrunner-server/api/v2/proto/jobs/v1beta"
+)
+
+func Push(in *jobsv1beta.PushRequest, out *jobsv1beta.Empty) error {
+	return nil
+}
+```
+
+Here is the method used in the RR to accept the `Job` from the external system.