Add oslo.messaging project

This is already covered as an oslo sub-project, but it would be
helpful to look at oslo.messaging in isolation since we'd like to
encourage some specialist reviewers for the project.

Change-Id: I0451f9c8e25a568f9a8ec1c3fb01e5b6ce63ab11

projects/oslo.messaging.json

@@ -0,0 +1,17 @@
+{
+    "name": "oslo.messaging",
+    "subprojects": [
+        "openstack/oslo.messaging"
+    ],
+    "core-team": [
+        "bnemec",
+        "dims-v",
+        "doug-hellmann",
+        "flaper87",
+        "jdanjou",
+        "markmc",
+        "mikalstill",
+        "russellb",
+        "zyluo"
+    ]
+}