Adding get secgroup
diff --git a/openstack/compute/v2/extensions/secgroups/requests.go b/openstack/compute/v2/extensions/secgroups/requests.go
index 0c14716..b852883 100644
--- a/openstack/compute/v2/extensions/secgroups/requests.go
+++ b/openstack/compute/v2/extensions/secgroups/requests.go
@@ -49,3 +49,15 @@
 
 	return result
 }
+
+func Get(client *gophercloud.ServiceClient, id string) GetResult {
+	var result GetResult
+
+	_, result.Err = perigee.Request("GET", resourceURL(client, id), perigee.Options{
+		Results:     &result.Body,
+		MoreHeaders: client.AuthenticatedHeaders(),
+		OkCodes:     []int{200},
+	})
+
+	return result
+}