[docs] add link to ML Flow and treesnip in LightGBM docs (#3663)

* [docs] add link to ML Flow LightGBM docs

* Update README.md
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* added treesnip
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

README.md

@@ -94,6 +94,10 @@ Ruby gem: https://github.com/ankane/lightgbm
 
 LightGBM4j (Java high-level binding): https://github.com/metarank/lightgbm4j
 
+ML Flow (experiment tracking, model monitoring framework): https://github.com/mlflow/mlflow
+
+`{treesnip}` (R `{parsnip}`-compliant interface): https://github.com/curso-r/treesnip
+
 Support
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