Readme Update

README.md

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 ## What's inside?
 
 A set of modules are provided to solve the scalar diffraction problem. The codes are GPU-friendly, compatible with well-known computation libraries (Numpy, TensorFlow) and they support batch processing. Using the TensorFlow backend, computations become autograd-compatible and could be mounted on machine learning models. Angular spectrum algorithm is the primary work horse for field propagation though other custom solvers could be used. Aside the built-in Numpy and TensorFlow backends, any computational means could be employed to process tensor operations.