Add code example

README.md

@@ -3,3 +3,41 @@
 Simple goroutine worker pool written in Go.
 
 Status: Work in progress.
+
+Example:
+
+```go
+package main
+
+import (
+	"log"
+	"time"
+
+	"github.com/nxshock/gwp"
+)
+
+// Job function
+func f(i int) error {
+	log.Printf("Job №%d", i)
+
+	// Simulate work
+	time.Sleep(time.Second)
+
+	return nil
+}
+
+func main() {
+	worker := gwp.New(4)
+
+	for i := 0; i < 100; i++ {
+		n := i
+		// Send job
+		worker.Add(func() error {
+			return f(n)
+		})
+	}
+
+	// Wait all jobs to complete
+	worker.CloseAndWait()
+}
+```