Update readme

See merge request T202419359994630/project2608132-275917!43

docs: fix formatting in README.md for debugging section

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update README.md

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docs: update README.md for makefile docs

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docs: add table of contents and design document

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docs: add test and links

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docs: overview

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docs: fs

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docs: update System trap.md

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docs: change the code of trap_handler in System trap.md

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docs: some small changes in Process scheduling.md and Process control block.md

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docs: add catalogue to System trap.md

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Process

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docs: add demo

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