Add provider registry support.
diff --git a/context.go b/context.go
new file mode 100644
index 0000000..0a73890
--- /dev/null
+++ b/context.go
@@ -0,0 +1,11 @@
+package gophercloud
+
+type Context struct {
+	providerMap map[string]*Provider
+}
+
+func TestContext() *Context {
+	return &Context{
+		providerMap: make(map[string]*Provider),
+	}
+}