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docs: add vector similarity search and update DSN options in README #10

Job	Run time
Build - x86_64-pc-windows-msvc	6m 41s
Build - x86_64-apple-darwin	3m 55s
Build sdist	19s
Build - aarch64-apple-darwin	4m 31s
Build - aarch64-unknown-linux-gnu	4m 52s
Build - x86_64-unknown-linux-gnu	3m 49s
Test - Python 3.12 (macos-latest)	24s
Test - Python 3.12 (windows-latest)	47s
Test - Python 3.12 (ubuntu-latest)	22s
	25m 40s