Actually add documentation

Docs/Layers/crab_address.md

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+
+
+ crab_address 
+==============
+
+
+
+<img src='https://mapcomplete.osm.be/./assets/layers/crab_address/housenumber_blank.svg' height="100px"> 
+
+Address data for Flanders by the governement, suited for import into OpenStreetMap. Datadump from 2021-10-26. This layer contains only visualisation logic. Import buttons should be added via an override. Note that HNRLABEL contains the original value, whereas _HNRLABEL contains a slightly cleaned version
+
+
+
+
+## Table of contents
+
+1. [crab_address](#crab_address)
+  - [Basic tags for this layer](#basic-tags-for-this-layer)
+  - [Supported attributes](#supported-attributes)
+    + [render_crab](#render_crab)
+
+
+
+
+
+  - <img src='../warning.svg' height='1rem'/> This layer is loaded from an external source, namely `https://raw.githubusercontent.com/pietervdvn/MapComplete-data/main/CRAB_2021_10_26/tile_{z}_{x}_{y}.geojson`
+  - This layer is needed as dependency for layer [osm-buildings](#osm-buildings)
+
+
+[Go to the source code](../assets/layers/crab_address/crab_address.json)
+
+
+
+ Basic tags for this layer 
+---------------------------
+
+
+
+Elements must have the all of following tags to be shown on this layer:
+
+
+
+  - HUISNR~^..*$
+
+
+
+
+ Supported attributes 
+----------------------
+
+
+
+
+
+### render_crab 
+
+
+
+_This tagrendering has no question and is thus read-only_
+
+ 
+
+This document is autogenerated from assets/layers/crab_address/crab_address.json