Added warning and recommendation about possible loss of multilingual and coding capabilities.

changed example of custom matrix to be a good example for preserving multilingual capabilities, coding/reasoning skills, and a bit of decensoring

corrected --matrix to --imatrix

added info and links to pre-computed matrix files

add info about TinyStories source

Update README.md

Added info about context size

added datasets descriptions and links

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Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

Create README.md