Adds more info to README.

README.md

@@ -1 +1,32 @@
-kt - a Kafka command line tool
+# kt - a Kafka tool
+
+## Example usage:
+
+    $ kt -help
+    Usage of kt:
+      -brokers string
+            Comma separated list of brokers. (default "localhost:9092")
+      -offset string
+            Colon separated offsets where to start and end reading messages.
+      -topic string
+            Topic to consume.
+    $ kt -topic kt-test
+    Partition=0 Offset=0 Key= Value=Hello, World 0
+    Partition=0 Offset=1 Key= Value=Hallo, Welt
+    Partition=0 Offset=2 Key= Value=Bonjour, monde
+    ^C2016/01/26 06:29:19 Received interrupt - shutting down...
+    $ kt -topic kt-test -offset 1:
+    Partition=0 Offset=1 Key= Value=Hallo, Welt
+    Partition=0 Offset=2 Key= Value=Bonjour, monde
+    ^C2016/01/26 06:29:29 Received interrupt - shutting down...
+    $ kt -topic kt-test -offset 1:1
+    Partition=0 Offset=1 Key= Value=Hallo, Welt
+    $
+
+## Installation
+
+You can download kt via the [Releases](https://github.com/fgeller/kt/releases) section.
+
+Alternatively, the usual way via the go tool, for example:
+
+    $ GO15VENDOREXPERIMENT=1 go install github.com/fgeller/kt