add example and short build instructions

Author: dennwc

README.md

@@ -1 +1,8 @@
-Go SDK for Pocketbook based on libinkview.
+Go SDK for Pocketbook based on libinkview.
+
+To build your app or examples, run:
+
+```bash
+cd ./go_app_path/
+docker run --rm -v $PWD:/app dennwc/pocketbook-go-sdk main.go
+```

examples/devinfo/main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"github.com/dennwc/inkview"
+)
+
+func main() {
+	var (
+		log *ink.Log
+	)
+	ink.Run(func(e ink.Event) {
+		switch e := e.(type) {
+		case ink.InitEvent:
+			ink.ClearScreen()
+			log = ink.NewLog(ink.Pad(ink.Screen(), 10), 14)
+
+			log.Println("Device:")
+			log.Println(ink.DeviceModel())
+			log.Println(ink.SoftwareVersion())
+			log.Println(ink.HwAddress())
+			log.Println()
+
+			for _, name := range ink.Connections() {
+				log.Printf("conn: %q", name)
+			}
+			log.Draw()
+
+			ink.FullUpdate()
+		case ink.ExitEvent:
+			log.Close()
+		case ink.PointerEvent:
+			if e.State == ink.PointerDown {
+				log.Printf("click: %v", e.Point)
+				log.Draw()
+				ink.SoftUpdate()
+			}
+		case ink.KeyEvent:
+			if e.Key == ink.KeyPrev && e.State == ink.KeyStateDown {
+				ink.Close()
+			}
+		}
+	})
+}