doc: add read/write example to readme

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>

README.md

@@ -44,6 +44,28 @@ err := conn.ParseCmdLineArgs(args)
 
 For other configuration options see the full documentation.
 
+### Object I/O
+
+Object in RADOS can be written to and read from with through an interface very
+similar to a standard file I/O interface:
+
+```go
+    // open a pool handle
+    pool, err := conn.OpenPool("mypool")
+
+    // write some data
+    bytes_in := []byte("input data")
+    err = pool.Write("obj", bytes_in, 0)
+
+    // read the data back out
+    bytes_out := make([]byte, len(bytes_in))
+    n_out, err := pool.Read("obj", bytes_out, 0)
+
+    if bytes_in != bytes_out {
+        fmt.Println("Output is not input!")
+    }
+```
+
 ### Pool maintenance
 
 The list of pools in a cluster can be retreived using the `ListPools` method