add tutorial on renewables part 3/3: renewable resources#7

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OFR-IIASA wants to merge 2 commits intobehnam-zakeri:tutorials_updatefrom OFR-IIASA:tutorial_update_renewable_resources

+586-26

Commits on Sep 30, 2019

updates after Paul's comments
behnam-zakeri
committed

Commits on Oct 1, 2019

add part3/3 of renewable tutorial series, explaing how to add renewable resources
OFR-IIASA
committed