Added Activeloop to the frameworks section of the ReadMe

[kristina-arezina]

Activeloop is the fastest computer vision dataset management framework for data streaming, version-control and collaboration. The open-source package neatly rearranges your computer vision datasets into Data 2.0 format, represented as NumPy-like, cloud-native arrays. A Data 2.0 dataset comes with a multitude of features for more efficient machine and deep learning workflows.