Proposal: Enable GitHub Discussions and configure mailing lists (apache#1174)

* Enable GitHub Discussions and configure mailing lists

* Update documentation link

Author: paulirwin

.asf.yaml

@@ -1,5 +1,13 @@
 # Apache YAML Features for Git Repositories
-# See the documentation at: https://cwiki.apache.org/confluence/display/INFRA/git+-+.asf.yaml+features
+# See the documentation at: https://github.com/apache/infrastructure-asfyaml/blob/main/README.md
+
+# See our mailing lists here: https://lucenenet.apache.org/contributing/mailing-lists.html
+notifications:
+  commits: commits@lucenenet.apache.org
+  issues: dev@lucenenet.apache.org
+  pullrequests: dev@lucenenet.apache.org
+  discussions: dev@lucenenet.apache.org
+  # jobs: builds@lucenenet.apache.org # This is probably too noisy to enable
 
 github:
   description: "Apache Lucene.NET"
@@ -24,6 +32,8 @@ github:
     issues: true
     # Enable projects for project management boards
     projects: false
+    # Enable discussions
+    discussions: true
 
   # Disallow forced pushes
   protected_branches: