Add entry for ongoing network ddos

Closes: #20.

content/issues/2022-06-09-network-ddos.md

+---
+title: Network DDoS
+date: 2022-06-09 14:00:00
+resolved: false
+# Possible severity levels: down, disrupted, notice
+severity: disrupted
+affected:
+  - v3 Onion Services
+section: issue
+---
+
+We are experiencing a network-wide DDoS attempt impacting the
+performance of the Tor network, which includes both onion services and
+non-onion services traffic. We are currently investigating potential
+mitigations.