Prepare 0.1

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Proposed initial CHANGELOG entry:

• Initial release with support for Android, iOS, macOS, Windows, and Linux/UNIX-like platforms. See the README for details.

These are the steps remaining for the release after this merges:

• [x] Generate the Android Maven artifacts
• [x] Create Git tag (TODO: Should we check-in the generated artifacts for the tag to crates.io users have another comparison reference?)
• [x] Push tag
• [x] cargo publish (--allow-dirty may be needed based on the above)
• [x] Create companion GitHub release

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This release is now finished. The associated GitHub release can be found here and has the pre-compiled Android artifacts attached in a reproducible format as well. It was decided that a Git tag with its own commit had poor enough UX in Git's CLI that it wasn't worth putting the artifacts there.