added	bin/pledge
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added	docs/explanation/measures.md
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added	docs/explanation/running-ehrql.md
added	docs/explanation/selecting-populations-for-study.md
added	docs/explanation/using-ehrql-in-opensafely-projects.md
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added	docs/how-to/assign-multiple-columns.md
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added	docs/how-to/define-population.md
added	docs/how-to/dummy-data.md
added	docs/how-to/dummy-measures-data.md
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added	docs/how-to/examples.md