Add data generator folder

data/README.rst

@@ -25,6 +25,9 @@ on every data file you have changed, so minor encoding differences (such as
 wether or not to put `"` around fields in a CSV) do not result in spurious
 merge conflicts later on.
 
+We also added the *dataGeneratorScripts* folder, that includes some python scripts
+which generate data files for the data repositories from various sources.
+
 Where to get the data: Public Domain
 ------------------------------------
 

data/dataGeneratorScripts/generateRenewables/README.rst

@@ -0,0 +1,22 @@
+renewable_energy import script
+==============================
+
+The importMarktStammDaten.py script imports data from the Marktstammdaten Register and saves them into the
+renewable_energy data file (2018.csv). If one wants to work with the original data from the Marktstammdaten Register,
+one should download the original Xml files and save them into a folder and adapt the path in the script. Also make sure to have the *reloadfromXML* boolean set as *True*.
+Once you parsed the xml files once, you can also use the json files that are created during the xml parsing.
+In order to use the json files set *reloadfromXML* boolean set as *False*.
+
+Note that if you want the parse the xml data you need to install the third party lxml python package (Download and install https://lxml.de/).
+
+The json file that is used to update all ags keys to 2018 is downloaded from https://www.xrepository.de/api/xrepository/urn:xoev-de:bund:destatis:bevoelkerungsstatistik:codeliste:ags.historie_2021-12-31/download/Destatis.AGS.Historie_2021-12-31.json
+and holds data on all ags keys and changes that happend after 2006. 
+
+More info on the Marktstammdaten register:
+The Marktstammdaten Register lists all local energy sources (alle Strom- und Gaserzeugungsanlagen)
+in germany including wind turbines, solar cells etc. but also fossil fuel dependent energy producers
+like small "Blockheizkraftwerke" (more than 2.8 million entries). (almost) All units come with ags keys,
+which is why we use this source to generate our renewable_energy data. The Marktstammdaten Register
+provides a full data download under https://www.marktstammdatenregister.de/MaStR/Datendownload.
+However the zip-file is ~900 MByte and the unziped XML-files are more than 19 GB. This is why we dont
+provide them here directly but feel free to download them on your own and play around with the python script.