LFX: Add Knative eventing project for March - May term (#1118)

* Add Knative Eventing cross namespace event links project

Signed-off-by: Calum Murray <cmurray@redhat.com>

* fix wording and formatting

Signed-off-by: Calum Murray <cmurray@redhat.com>

---------

Signed-off-by: Calum Murray <cmurray@redhat.com>

programs/lfx-mentorship/2024/01-Mar-May/project_ideas.md

@@ -74,3 +74,18 @@
 - Issue: <https://github.com/vitessio/vitess/issues/14931>
 
 ---
+
+### Knative Eventing
+
+#### Cross Namespace Event Links
+
+- Description: One of the most requested features in Knative Eventing over the past few years has been for triggers in different namespaces than brokers, and for subscriptions
+  in different namespaces than channels. More information can be found in the upstream issue.
+- Expected Outcome: Knative Eventing Triggers and Subscriptions can reference Brokers or Channels in a namespace different from their own if the user possesses the necessary
+  permissions to do so.
+- Recommended Skills: Go, Kubernetes
+- Mentor(s):
+  - Calum Murray (@Cali0707, cmurray@redhat.com)
+  - Pierangelo Di Pilato (@pierdipi, pierdipi@redhat.com)
+- Upstream Issue: https://github.com/knative/eventing/issues/7530
+