add upstream contribution opportunities

etcd-io/etcd/upstream-contribution-opportunities/opportunities.md

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+Recently etcd v3.5
+
+https://etcd.io/blog/2021/announcing-etcd-3.5/
+
+Venues for contribution
+
+- Automated releases
+
+```
+Historically, etcd releases have been a large undertaking due to infrequency, because of the large delta, and a need for release automation. We will develop an automated release system that is more accessible to the community.
+```
+
+- Many sections mentioned in https://etcd.io/blog/2021/announcing-etcd-3.5/ are all venues for contribution
+    - Security
+    - Features
+    - Bug fixes
+    - Performance
+    - Monitoring
+    - Testing
+    - Platforms
+    - Developer experience
+    - Community
+
+- Tailscale uses etcd - https://tailscale.com/blog/an-unlikely-database-migration/