Add quickstart and development guide

Change-Id: I0f08147bb273c1baf4516a058c715ddd6fbd43f9
diff --git a/quickstart.rst b/quickstart.rst
index 96162f1..4826e48 100644
--- a/quickstart.rst
+++ b/quickstart.rst
@@ -1,2 +1,7 @@
 Quick Start
 ===========
+
+.. note::
+    We are recently migrating BMV2 version of ``fabric.p4`` to ``fabric-tna`` repository.
+    We will be able to build a software emulated environment for SD-Fabric once that is done.
+    Stay tuned.