feature/shared file systems: create share (#119)

* sfs/add url for create

* sfs/results: add share type and result type

* sfs/requests: add CreateOpts and Create method

* sfs/tests: add tests for creating a share

* sfs/shares: fixes according to comments

* sfs/create: fix Metadata field naming in Share
diff --git a/openstack/sharedfilesystems/v2/shares/urls.go b/openstack/sharedfilesystems/v2/shares/urls.go
new file mode 100644
index 0000000..4fba746
--- /dev/null
+++ b/openstack/sharedfilesystems/v2/shares/urls.go
@@ -0,0 +1,7 @@
+package shares
+
+import "github.com/gophercloud/gophercloud"
+
+func createURL(c *gophercloud.ServiceClient) string {
+	return c.ServiceURL("shares")
+}