Add beginnings of a design plan

We need a reasonable overview of what we intend to build, without
getting into too much implementation detail.

design-overview/README.md

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+_[N.B. This text is incomplete, contains errors and/or inaccuracies -
+question and seek clarification, rather than dismiss.]_
+
+# Design Overview
+
+We need a somewhat high level view of what we are intending to build. It should
+include aspects of the low level details but we are _not_ aiming at your
+corporate-style UML diagrams - we want something that has a reasonable chance
+of holding true to what gets created.
+
+
+## Diagram
+
+As it stands, the diagram is intended to get the ball rolling.
+If you want to edit or view the original diagram, see [Dia](https://wiki.gnome.org/Apps/Dia).
+
+
+## Requirements
+
+### Indymedia past
+
+For the desktop format web front end we are choosing to strictly hold true to
+the format of the original indymedia community.
+We will diverge a little for mobile devices.
+
+Core functionality that we aim to replicate:
+
+- Three column layout (at least for desktop)
+  - Centre: Feature articles
+  - Left: Links
+  - Right: Newswire
+- IMC membership
+- Curation
+  - "Moderation" tools
+  - Flagging
+- Rollback
+  - Removal of a data source (feed) optionally removes any existing data from
+    that source
+- ...
+
+Ref: [UK Indymedia](https://indymedia.org.uk)
+Ref: [Oxford IMC](https://www.indymedia.org.uk/en/regions/oxford/)
+
+### Indymedia present
+
+Helping work toward a semantic web.
+
+- Tags/ metadata as a first-class citizen
+  - It should be trivial to embelish existing data with more
+  - Searching/filtering should be fast
+- ...
+
+### Indymedia future
+
+This comes later. And is not solely for us to define.
+
+### Graceful degradation
+
+We aim to design for accessibility first. All pages should function and read
+well - at least for their essential uses - without `Javascript` (JS) or even
+`CSS`.
+
+While `JS` will be utilised, it must only be done so to enhance - it must never
+be the only way to achieve something.
+
+_[Can anyone think of a case where we can't uphold this? - Open an issue]_
+
+