Add DESIGN.md

Author: Powersource

docs/DESIGN.md

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+# Patchwork's Design Principles
+
+This document describes the design goals and philosophy of Patchwork. Features of and changes to Patchwork should always aim to follow these principles. If we really want to add a feature/make a change to Patchwork that goes against these principles, we should think about changing the principles first, rather than ignoring them and making the change anyway.
+
+This document should be version tracked, and any change to it should go through the [advice process](http://www.reinventingorganizationswiki.com/Decision_Making) with the stakeholders listed below.
+
+### Stakeholders
+* Patchwork contributors
+* Patchwork users
+* The broader Scuttlebutt community
+* People outside the Scuttlebutt community who might be affected
+
+## Design goals
+
+### Goals and scope: Patchwork should...
+* Follow the [Scuttlebutt principles](https://www.scuttlebutt.nz/principles/)
+* Be a client that people can feel confident recommending to their friends who aren't using Scuttlebutt
+  * Polished enough usability for people without patience or skills for tech troubleshooting
+  * Safety, blocking, harassment-stopping features for people concerned about those things
+  * Strike a balance: people should know how much data they're making public; also make it hard to find some public data which could be used for harassment
+* Be a fun client to use, users should enjoy using it and, in a positive way, be tempted to try other Scuttlebutt clients
+* Look good
+    
+### Non-goals: Patchwork is not...
+* A place where we experiment with new features - Try it in other clients first
+* For message types outside the core social networking use case. Messages such as posts, comments, gatherings, and blogs are in scope; messages such as chess and git-ssb are out of scope.
+
+
+### Roadmap
+* Eventually retire Patchwork 3, potentially transferring the Patchwork name to another client, which might become Patchwork 4
+* Maintain functionality until Patchwork 3 is retired.  Focus more on maintenance than new features.
+* Potentialy remove less-used features if we don't have energy to maintain them
+* While accepting that Patchwork 3 is a legacy codebase, try to keep it easy to maintain, and help out (potential) new contributors