Actually add documentation

Docs/Layers/direction.md

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+ direction 
+===========
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+
+This layer visualizes directions
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+
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+## Table of contents
+
+1. [direction](#direction)
+      * [Themes using this layer](#themes-using-this-layer)
+  - [Basic tags for this layer](#basic-tags-for-this-layer)
+  - [Supported attributes](#supported-attributes)
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+  - This layer cannot be toggled in the filter view. If you import this layer in your theme, override `title` to make this toggleable.
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+#### Themes using this layer 
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+  - [surveillance](https://mapcomplete.osm.be/surveillance)
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+
+[Go to the source code](../assets/layers/direction/direction.json)
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+
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+ Basic tags for this layer 
+---------------------------
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+
+Elements must have the all of following tags to be shown on this layer:
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+  - camera:direction~^..*$|direction~^..*$
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+
+
+
+ Supported attributes 
+----------------------
+
+ 
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+This document is autogenerated from assets/layers/direction/direction.json