README for Papertrail hook with usage info.

hooks/papertrail/README.md

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+# Papertrail Hook for Logrus
+
+## Usage
+
+You can find your Papertrail UDP port on your [Papertrail account page](https://papertrailapp.com/account/destinations).
+
+```go
+import (
+  "log/syslog"
+  "github.com/Sirupsen/logrus"
+  "github.com/Sirupsen/logrus/hooks/papertrail"
+)
+
+func main() {
+  log       := logrus.New()
+  hook, err := logrus_papertrail.NewPapertrailHook("logs.papertrailapp.com", YOUR_PAPERTRAIL_UDP_PORT, YOUR_APP_NAME)
+
+  if err == nil {
+    log.Hooks.Add(hook)
+  }
+}
+```