chore: add meeting issue template

.github/ISSUE_TEMPLATE/meeting-announcement-template.md

@@ -0,0 +1,24 @@
+---
+name: Meeting announcement template
+about: Announce the next Software WG open meeting
+title: 'Next Open Software WG meeting: '
+labels: 'C: Community, C: Meeting, S: Ready, S: Scheduled'
+assignees: ''
+
+---
+
+The next meeting will be on `<date>`. 
+
+The meeting will held on `<wherever>`. Here is the link:
+
+`<ADD LINK>`
+
+Meeting minutes from the last meeting are here:
+
+`<ADD LINK>`
+
+Please comment on this ticket:
+
+- to note any items you'd like to discuss
+- to note which meeting session you are likely to attend (so we have some idea of numbers)
+- if you are unable to attend either slot