fix to add SO VNFM Adapter description

Add SO VNFM Adapter description

Change-Id: I8c39b2100ecc9a863d302dec76966017de6abcdc
Issue-ID: SO-1795
Signed-off-by: byungwoojun <byung-woo.jun@ericsson.com>
diff --git a/docs/architecture/architecture.rst b/docs/architecture/architecture.rst
index 681e9db..52eb38c 100644
--- a/docs/architecture/architecture.rst
+++ b/docs/architecture/architecture.rst
@@ -101,6 +101,14 @@
    * Service statistic
    * Service Process Instance Rendering and Detail
 
+**SO VNFM Adapter**
+
+  Support external SVNFMs through SOL003 APIs
+   * Create, Instantiate, Terminate and Delete VNF, including Granting, Subscription and Lifecycle Notifications
+   * Tracking capability which VNFM instance has handled with which VNF instance
+   * BPMN Building Block workflows and Java-based recipes for VNF LCM
+   * VNFM Simulator for validating SO VNFM Adapter NBI and SBI for integration testing
+
 Third Party and Open Source
 ---------------------------