Add initial list of StackStorm Adopters

ADOPTERS.md

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+This is an alphabetical list of known adopters of [StackStorm](https://stackstorm.com/) event-driven automation aka IFTTT for Ops platform.
+
+* Bitovi - [[ Blog ](https://www.bitovi.com/blog/stackstorm-solves-devops-automation-for-enterprise-client)], [[ Case study ](https://stackstorm.com/case-study-bitovi/)]
+* [DMM.com](https://dmm-corp.com/en/) - One of the largest content providers in Japan.
+ StackStorm is used in Operations helping to maintain online services at scale [[ Case study ](https://stackstorm.com/case-study-dmm/)].
+* Dimension Data - https://stackstorm.com/case-study-dimension-data/
+* Encore - https://stackstorm.com/case-study-encore/
+* NL-ix - https://stackstorm.com/case-study-nlix/
+* Netflix - https://stackstorm.com/case-study-netflix/
+* Pearson - https://stackstorm.com/case-study-pearson/
+* SciLifeLab - https://stackstorm.com/case-study-scilifelab
+* Target - https://stackstorm.com/case-study-target/