Add README.md to async-graphql-axum crate

We need some way to document how to use this crate for users who are yet to upgrade to axum `0.6.*`. The idea here is that when we publish the crate again we will increase it's version making `4.0.15` the last version supporting axum `0.5.*`.
async-graphql · Oct 9, 2022 · 7a5acd8 · 7a5acd8
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+Supports axum version `0.6.*`.
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+For axum `0.5.*` use version `4.0.15` of this crate.