docs(nx-affected-matrix): add known issues

[ronnetzer]

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Added known issues section to readme with workaround
Issue Number: fixes #53

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✅ Successfully ran 2 targets

• nx run-many --projects=nx-affected-matrix --skip-nx-cache=false --target=build --parallel=3 --scan --with-deps
• nx run-many --projects=nx-affected-matrix --skip-nx-cache=false --target=test --parallel=3 --scan --with-deps=false

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