moved http-cache README into crate dir, added symlink to root for convenience

Author: 06chaynes

README.md

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+http-cache/README.md

README.md

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+# http-cache
+
+[![CI](https://img.shields.io/github/workflow/status/06chaynes/http-cache/Rust?label=CI&style=for-the-badge)](https://github.com/06chaynes/http-cache/actions/workflows/rust.yml)
+[![Crates.io](https://img.shields.io/crates/v/http-cache?style=for-the-badge)](https://crates.io/crates/http-cache)
+[![Docs.rs](https://img.shields.io/docsrs/http-cache?style=for-the-badge)](https://docs.rs/http-cache)
+[![Codecov](https://img.shields.io/codecov/c/github/06chaynes/http-cache?style=for-the-badge)](https://app.codecov.io/gh/06chaynes/http-cache)
+![Crates.io](https://img.shields.io/crates/l/http-cache?style=for-the-badge)
+
+<img align="right" src="https://raw.githubusercontent.com/06chaynes/http-cache/latest/.assets/images/http-cache_logo_bluegreen.svg" height="150px" alt="the http-cache logo">
+
+A caching middleware that follows HTTP caching rules,
+thanks to [http-cache-semantics](https://github.com/kornelski/rusty-http-cache-semantics).
+By default, it uses [cacache](https://github.com/zkat/cacache-rs) as the backend cache manager.
+
+## How do I use this?
+
+Likely you won't! At least not directly. Unless you are looking to implement a custom backend cache manager
+or client middleware you'll probably want to pull in one of the existing client implementations instead.
+See the [Provided Client Implementations](#provided-client-implementations) section below.
+
+## Minimum Supported Rust Version (MSRV)
+
+1.54.0
+
+## Install
+
+With [cargo add](https://github.com/killercup/cargo-edit#Installation) installed :
+
+```sh
+cargo add http-cache
+```
+
+## Features
+
+The following features are available. By default `manager-cacache` is enabled.
+
+- `manager-cacache` (default): use [cacache](https://github.com/zkat/cacache-rs), a high-performance disk cache, for the manager backend.
+- `manager-moka` (disabled): use [moka](https://github.com/moka-rs/moka), a high-performance in-memory cache, for the manager backend.
+- `with-http-types` (disabled): enable [http-types](https://github.com/http-rs/http-types) type conversion support
+
+## Documentation
+
+- [API Docs](https://docs.rs/http-cache)
+
+## Provided Client Implementations
+
+- **Surf**: See [README](http-cache-surf/README.md) for more details
+- **Reqwest**: See [README](http-cache-reqwest/README.md) for more details
+
+## License
+
+Licensed under either of
+
+- Apache License, Version 2.0
+  ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
+- MIT license
+  ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
+
+at your option.
+
+## Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.