Improve readme

README.md

@@ -1,10 +1,79 @@
 # go-engine.io
 
-An implementation of the [engine.io](https://socket.io/docs/v4/engine-io-protocol/) protocol in go.
+[![Build Workflow](https://github.com/lewisgibson/go-engine.io/actions/workflows/build.yaml/badge.svg)](https://github.com/lewisgibson/go-engine.io/actions/workflows/build.yaml)
+[![Pkg Go Dev](https://pkg.go.dev/badge/github.com/lewisgibson/go-engine.io)](https://pkg.go.dev/github.com/lewisgibson/go-engine.io)
 
-## todo
+An implementation of the [engine.io](https://socket.io/docs/v4/engine-io-protocol/) v4 protocol and client in go.
 
--   Server implementation
--   Integration testing
--   End to end testing between client and server
--   Support v2 and v3 parsing
+## Resources
+
+-   [Discussions](https://github.com/lewisgibson/go-engine.io/discussions)
+-   [Reference](https://pkg.go.dev/github.com/lewisgibson/go-engine.io)
+-   [Examples](https://pkg.go.dev/github.com/lewisgibson/go-engine.io#pkg-examples)
+
+## Features
+
+-   [x] [HTTP Long-Polling Transport](https://socket.io/docs/v4/engine-io-protocol#http-long-polling)
+-   [x] [WebSocket Transport](https://socket.io/docs/v4/engine-io-protocol#websocket)
+-   [x] [Binary Support](https://socket.io/docs/v4/engine-io-protocol#headers)
+
+## Installation
+
+```sh
+go get github.com/lewisgibson/go-engine.io
+```
+
+## Quickstart
+
+```go
+client, _ := engineio.NewSocket("http://localhost:3000/engine.io/", engineio.SocketOptions{
+    Client: &http.Client{
+        Timeout: time.Second * 30,
+    },
+    Header: &http.Header{
+        "Authorization": []string{"Bearer token"},
+    },
+    Upgrade:         engineio.Pointer(true),
+    RememberUpgrade: engineio.Pointer(true),
+    Transports: &[]engineio.TransportType{
+        engineio.TransportTypePolling,
+        engineio.TransportTypeWebSocket,
+    },
+})
+
+// Bind an open handler.
+client.OnOpen(func() {
+    client.Send(ctx, []engineio.Packet{
+        {Type: engineio.PacketMessage, Data: []byte("Hello")},
+    })
+})
+
+// Bind a message handler.
+client.OnMessage(func(data []byte) {
+    fmt.Printf("Message from server: %s\n", string(data))
+})
+
+// Bind a close handler.
+client.OnClose(func(reason string, cause error) {
+    fmt.Printf("Close: %v, %v\n", reason, cause)
+})
+
+// Bind an error handler.
+client.OnError(func(err error) {
+    fmt.Printf("Error: %v\n", err)
+})
+
+// Open the client.
+client.Open(context.Background())
+
+// Wait for 10 seconds.
+<-time.After(time.Second * 10)
+
+// Close the client.
+client.Close(context.Background())
+```
+
+## Todo
+
+-   [ ] Server implementation
+-   [ ] Parse v2/v3 protocol