Convert README to English with natural flow

- Recreated entire README in English
- Preserved all technical details and data
- Improved flow and readability
- Kept Swedish version as README_SV.md for reference
- All charts and analysis now in English

timelines/Erlang/run_1.tsv

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timelines/Erlang/run_2.tsv

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timelines/Erlang/run_3.tsv

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timelines/Erlang/run_4.tsv

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