Actually add documentation

Docs/Layers/viewpoint.md

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+ viewpoint 
+===========
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+
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+<img src='https://mapcomplete.osm.be/./assets/layers/viewpoint/viewpoint.svg' height="100px"> 
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+A nice viewpoint or nice view. Ideal to add an image if no other category fits
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+
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+## Table of contents
+
+1. [viewpoint](#viewpoint)
+  - [Basic tags for this layer](#basic-tags-for-this-layer)
+  - [Supported attributes](#supported-attributes)
+    + [images](#images)
+    + [viewpoint-description](#viewpoint-description)
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+[Go to the source code](../assets/layers/viewpoint/viewpoint.json)
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+ Basic tags for this layer 
+---------------------------
+
+
+
+Elements must have the all of following tags to be shown on this layer:
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+
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+  - <a href='https://wiki.openstreetmap.org/wiki/Key:tourism' target='_blank'>tourism</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:tourism%3Dviewpoint' target='_blank'>viewpoint</a>
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+
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+ Supported attributes 
+----------------------
+
+
+
+**Warning** This quick overview is incomplete
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+attribute | type | values which are supported by this layer
+----------- | ------ | ------------------------------------------
+[<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/description#values) [description](https://wiki.openstreetmap.org/wiki/Key:description) | [string](../SpecialInputElements.md#string) | 
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+### images 
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+
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+_This tagrendering has no question and is thus read-only_
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+### viewpoint-description 
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+The question is **Do you want to add a description?**
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+This rendering asks information about the property  [description](https://wiki.openstreetmap.org/wiki/Key:description) 
+This is rendered with `{description}` 
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+This document is autogenerated from assets/layers/viewpoint/viewpoint.json