Actually add documentation

Docs/Layers/current_view.md

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+ current_view 
+==============
+
+
+
+
+
+A meta-layer which contains one single feature, namely the BBOX of the current map view. This can be used to trigger special actions. If a popup is defined for this layer, this popup will be accessible via an extra button on screen.
+
+The icon on the button is the default icon of the layer, but can be customized by detecting 'button=yes'.
+
+
+
+
+## Table of contents
+
+1. [current_view](#current_view)
+  - [Basic tags for this layer](#basic-tags-for-this-layer)
+  - [Supported attributes](#supported-attributes)
+
+
+
+
+
+  - This layer is not visible by default and must be enabled in the filter by the user. 
+  - Not visible in the layer selection by default. If you want to make this layer toggable, override `name`
+  - Not rendered on the map by default. If you want to rendering this on the map, override `mapRenderings`
+
+
+[Go to the source code](../assets/layers/current_view/current_view.json)
+
+
+
+ Basic tags for this layer 
+---------------------------
+
+
+
+Elements must have the all of following tags to be shown on this layer:
+
+
+
+  - <a href='https://wiki.openstreetmap.org/wiki/Key:current_view' target='_blank'>current_view</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:current_view%3Dyes' target='_blank'>yes</a>
+
+
+
+
+ Supported attributes 
+----------------------
+
+ 
+
+This document is autogenerated from assets/layers/current_view/current_view.json