Adding documentation about getting wikidata stats. (#78)

Author: nciric

documents/wikidata_statistics.md

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+# Wikidata statistics per language
+
+These are the easiest way of getting per language stats:
+* [Lexicographical data/Statistics/Counts of various things by language](https://www.wikidata.org/wiki/Wikidata:Lexicographical_data/Statistics/Counts_of_various_things_by_language)
+* [Ordia stats, dynamic](https://ordia.toolforge.org/language/) where you can click on a language and get details about categories, e.g. for [Russian](https://ordia.toolforge.org/language/Q7737).
+
+
+# Wikidata Query Service
+One can also query [Wikidata Query Service](https://query.wikidata.org/) using SPARQL for details not readily available through above dashboards.
+
+Some example queries:
+* Serbian, [unique nouns](https://w.wiki/CtZx).
+* German, [unique possesive pronouns](https://w.wiki/CyfW).