Update README.md
Update README.md

Header added.
poprawki
Merge remote branch 'original/master'
Merge remote-tracking branch 'nosql/master'
better and clearer json
aggregation script
Merge pull request #57 from Socr4tes/master

Marek Dubrawa: Dane na temat spotakń ufo !
fixes
Merge pull request #58 from pslaski/master

agregacje
Dodalem skrypt PHP z agregacjami oraz zaktualizowalem plik opisowy.
Merge pull request #59 from Zygfryt/master

Agregacje - Daniel Szymczak
C# aggregations wiki and code on Ceny
Fixed typos
Update lwasak_agg.md
Merge pull request #60 from lwasak/master

Agregacje C#
poprawki
agregation results, changes the wiki
Update lwasak.md
Update lwasak.md