Add image diagrams, simplify explanations #4

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dabba-doubleyoo wants to merge 2 commits intoAI-Core:masterfrom

dabba-doubleyoo:master

Commits on Mar 18, 2020

Add image explanations + open source lena images for illustratoin
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Commits on Mar 23, 2020

Add image explanation diagrams & alter wording in some areas for simplicity.
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