ARROW-11150: [Rust] Add Arrow Rust Community section to Rust README
ARROW-11150: [Rust] Add Arrow Rust Community section to Rust README

Closes #9708 from andygrove/arrow-rust-community

Authored-by: Andy Grove <b36d8b74c0bb28b9ac4981e9f34b56d5fe00f5be@nvidia.com>
Signed-off-by: Andrew Lamb <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@nerdnetworks.org>

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