Add stub agendas for Wasmtime and Cranelift project meetings through mid-December (#3167)

meetings/cranelift/2021/cranelift-10-18.md

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+# October 18 project call
+
+**See the [instructions](../README.md) for details on how to attend**
+
+## Agenda
+1. Opening, welcome and roll call
+    1. Note: meeting notes linked in the invite.
+    1. Please help add your name to the meeting notes.
+    1. Please help take notes.
+    1. Thanks!
+1. Announcements
+    1. _Sumbit a PR to add your announcement here_
+1. Other agenda items
+    1. _Sumbit a PR to add your item here_
+
+## Notes
+
+### Attendees
+
+### Notes