proposal for decision 1 (#37)

Author: ChristianKuehnel

decisions/decision_001_mailman_to_discourse.md

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+# Decision 1: Working on a Mailman to Discourse migration
+
+## Background
+
+The LLVM foundation requested the Infrastructure working group (IWG) to work on
+a mailman to discourse migration [#6](https://github.com/llvm/llvm-iwg/issues/6).
+
+## Decision
+
+1. The IWG accepts the request from the LLVM foundation.
+2. The IWG sets up a sub-group who will work in this topic. The sub-group will
+   initially consist of:
+   * Kit Barton
+   * Mike Edwards
+   * Christian Kühnel
+   * Chris Lattner
+
+   More people are welcome to join.
+3. The sub-group will keep the rest of the IWG updated on the progress.
+4. The sub-group will be dissolved once the migration is completed or was
+   cancelled.