feat: add annoucements

annoucements.json

@@ -0,0 +1,14 @@
+[
+  {
+    "title": "Issue: Update to `1.71.0`",
+    "url": "https://github.com/VSCodium/vscodium/issues/1227"
+  },
+  {
+    "title": "Issue: Support for Windows 7",
+    "url": "https://github.com/VSCodium/vscodium/issues/1264"
+  },
+  {
+    "title": "Discussion: New icon",
+    "url": "https://github.com/VSCodium/vscodium/discussions/1218"
+  }
+]