Update isaac 2026 (#1528)

* Create isaac.yml

* Create isaac.yml

Author: JoeyLian

conference/CT/isaac.yml

@@ -0,0 +1,17 @@
+- title: ISAAC
+  description: International Symposium on Algorithms and Computation
+  sub: CT
+  rank:
+    ccf: C
+    core: B
+    thcpl: N
+  dblp: isaac
+  confs:
+    - year: 2026
+      id: isaac26
+      link: https://www.algo-door.com/isaac2026/index.html
+      timeline:
+        - deadline: '2026-06-26 23:59:59'
+      timezone: AoE
+      date: December 6-9, 2026
+      place: Hangzhou, China