Improvements to main README file and reference documentation#121

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rsbrooks wants to merge 2 commits intojquast:masterfrom rsbrooks:readme_docs_update

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Commits on Feb 16, 2024

Rewrote and reformatted the 'Introduction' section to improve readability. Updated 'Introduction' section header to 'What is wcwidth?'.
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Added 'Getting Started' and 'Helpful Resources for Contributors' sections to main README (docs/intro.rst). Rearranged content from existing sections, reformatted information, fixed minor grammatica…
rsbrooks
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