Add readme

README.md

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+# Queue
+
+[![GoDoc](https://godoc.org/github.com/sheerun/queue?status.svg)](https://godoc.org/github.com/sheerun/queue)
+[![Release](https://img.shields.io/github/release/sheerun/queue.svg)](https://github.com/sheerun/queue/releases/latest)
+[![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg)](LICENSE.txt)
+
+An blocking FIFO queue based on auto-growing circular buffer, without goroutines.
+
+## Usage
+
+```go
+q := New()
+
+var wg sync.WaitGroup
+
+wg.Add(2)
+
+go func() {
+  for i := 0; i < 10000; i++ {
+    q.Append(i)
+  }
+  wg.Done()
+}()
+
+go func() {
+  for i := 0; i < 10000; i++ {
+    if q.Pop() != i {
+      t.Errorf("Invalid returned index: %d", i)
+      wg.Done()
+      return
+    }
+  }
+  wg.Done()
+}()
+
+wg.Wait()
+```
+
+## License
+
+MIT