docs+build: Prepare for version 0.5.0 release

Change-Id: I4bd90a5229bc010cdcfd7c77c32ccfc62d72ac53
Refs: #3762
diff --git a/docs/releases.rst b/docs/releases.rst
index 780709e..bee9557 100644
--- a/docs/releases.rst
+++ b/docs/releases.rst
@@ -5,6 +5,7 @@
    :hidden:
    :maxdepth: 1
 
+   release-notes/release-notes-0.5.0
    release-notes/release-notes-0.4.1
    release-notes/release-notes-0.4.0
    release-notes/release-notes-0.3.4
@@ -15,6 +16,12 @@
    release-notes/release-notes-0.2.0
    release-notes/release-notes-0.1.0
 
+* **ndn-cxx version 0.5.0**
+  (:doc:`Release Notes <release-notes/release-notes-0.5.0>`, `Documentation <http://named-data.net/doc/ndn-cxx/0.5.0/>`__)
+
+  `src (git) <https://github.com/named-data/ndn-cxx/releases/tag/ndn-cxx-0.5.0>`__,
+  `src (tarball) <http://named-data.net/downloads/nfd-0.5.0.tar.bz2>`__ (`checksum <http://named-data.net/downloads/nfd-0.5.0.tar.bz2.sha256>`__)
+
 * **ndn-cxx version 0.4.1**
   (:doc:`Release Notes <release-notes/release-notes-0.4.1>`, `Documentation <http://named-data.net/doc/ndn-cxx/0.4.1/>`__)