feat: add proposal

Author: Sorunome

proposals/2996-tshift.md

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+# MSC2996: "There's an MSC for that!"
+
+Throughout fosdem 2021 multiple different features or ideas around matrix were discussed. As it turns
+out, most of them already had an MSC for that! One feature that was keep being brought up, was to get
+"There's an MSC for that!" onto a t-shirt. Unfortunately, there wasn't an MSC for that yet.
+
+## Proposal
+
+Get a t-shirt with "There's an MSC for that!" written on it.
+
+## Potential issues
+
+Once the spec is complete and there are no more MSCs the t-shirt will be obsolete.
+
+## Alternatives
+
+Instead of a shirt, a sweater or thelike could be used.
+
+## Security considerations
+
+Unfortunately not all people are able to wear t-shirts, so a solution for those would have to be
+found.
+
+## Unstable prefix
+
+In places where this proposal mentions `t-shirt`, `de.sorunome.t-shirt` is to be used instead