modified api specaccording to discussion

examples/api-design/open62541-ns0-pico.h

@@ -0,0 +1,4 @@
+#include "ua_namespace.h"
+
+Namespace UA_NamespaceZero_Static;_
+

examples/api-design/open62541-tcp.h

@@ -0,0 +1 @@
+#include "../networklayer.h"

examples/api-design/open62541.h

@@ -0,0 +1,2 @@
+#include "ua_types.h"
+#include "ua_application.h"