Added hpc,ai and hpc_ai directory

ai/README.md

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+* ai : This directory consists of labs related to traditional AI/ML/DL techniques and frameworks
+

hpc/README.md

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+ hpc: This directory contains labs related to HPC(Simulation) and parallel computing
+

hpc_ai/README.md

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+* hpc_ai: This directory contains labs related to usage of AI/ML/DL for Science/HPC Simulations
+