Fix missing file in docs

README.md

@@ -114,6 +114,9 @@ This project includes and makes use of several other projects/libraries/framewor
 > [_Fiona_](https://github.com/Toblerity/Fiona)
 > OGR's neat and nimble API for Python programmers.
 
+> [_Mapnik_](https://mapnik.org/)
+> Mapnik combines pixel-perfect image output with lightning-fast cartographic algorithms, backing OpenStreetMap
+
 ## License
 
 GNU GPLv3
@@ -122,6 +125,11 @@ GNU GPLv3
 
 This is a high-level summary of version progress. See [CHANGELOG.md](CHANGELOG.md) for a full list of changes.
 
+2022-07-27: **TagMaps v0.21.0**
+
+- Add export to Mapnik ([`9db0d0d`](https://github.com/Sieboldianus/TagMaps/commit/9db0d0dc0a266f9eef7c3aac5bf663337c096f80))
+- See a [jupyter lab notebook](https://ad.vgiscience.org/tagmaps-mapnik-jupyter/01_mapnik-tagmaps.html) that illustrates visualization of tag map data in [Mapnik](https://mapnik.org/)
+
 2021-02-22: **TagMaps v0.20.10**
 
 - fix emoji grapheme detection issue with `emoji>=1.01`

docs/user-guide/mapnik.md

@@ -0,0 +1,29 @@
+# Visualization with Mapnik
+
+As of tagmaps `0.21.0`, visualization in Mapnik is supported, as an alternative
+to the visualization in ESRI ArcGIS [illustrated in the tutorial](../tutorial/#arcmap).
+
+[Mapnik][mapnik] is the render engine backing [OpenStreetMap][osm]
+and offers extensive options to customize rendering of spatial data such as
+produced by tagmaps. Particularly, the label placement algorithm is on a par with
+the proprietary ArcGIS Maplex render engine and thus suited to render tagmaps data with Python
+Open Source Software.
+
+Enable this option with the flag [`--mapnik_export`](../../argparse/args/#-mapnik_export)
+```bash
+tagmaps --mapnik_export
+```
+
+If this flag is enabled, instead of creating a separate `emojiTable.csv`, 
+to be joined in ArcGIS to the shapefile,
+emoji will be stored directly in the generated output file (`allTagCluster.shp`)
+and can be directly rendered with Mapnik.
+
+**Jupyter Notebook Tutorial**
+
+A jupyter notebook illustrates the process for rendering of these shapefiles in Mapnik.
+
+* [Tag Maps rendering with Python and Mapnik](https://ad.vgiscience.org/tagmaps-mapnik-jupyter/01_mapnik-tagmaps.html)
+
+[mapnik]: https://mapnik.org/
+[osm]: https://www.openstreetmap.de/