added federated wiki talk

proposed/federated.md

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+# Infos
+
+auth-name       : ???
+
+need travel fee : appreciated, if possible
+need room       : no
+Location        : UK
+
+# Federated Wiki intro & plugin workshop
+
+Federated Wiki is a wiki where people don't have to agree. It has a cute architecture which is a mix between a wiki and a version control.
+At the venue we're planning to have a local Federated Wiki farm. Whoever is interested can learn how to set it up and use it. We would like to do an intro on the first day, and
+and offer an additional workshop about building plugins for it. The author of this tool Ward only will be able to join us remotely as he's based in the US.
+Intro 30min
+Workshop 1h +