Add Sleep For A Duration as a go til

go/sleep-for-a-duration.md

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+# Sleep For A Duration
+
+Many languages allow you to sleep for a certain number of milliseconds. In
+those languages, you can give `500` or `1000` to the sleep function to
+sleep for half a second and a second respectively. In Go, the duration of a
+call to [`time.Sleep`](https://golang.org/pkg/time/#Sleep) is in
+nanoseconds. Fortunately, there are constants that make it easy to sleep in
+terms of milliseconds.
+
+For example, you can sleep for a half a second (500 milliseconds) like so:
+
+```go
+package main
+
+import (
+    "time"
+)
+
+func main() {
+    time.Sleep(500 * time.Millisecond)
+}
+```
+
+Other available time constants are `Nanosecond`, `Microsecond`, `Second`,
+`Minute`, `Hour`.