Update README.md to say that the repo on Github has been archived.

README.md

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-
-**Minimum Supported Rust Version:** 1.63.0
-
-# Miniscript
-
-Library for handling [Miniscript](http://bitcoin.sipa.be/miniscript/),
-which is a subset of Bitcoin Script designed to support simple and general
-tooling. Miniscripts represent threshold circuits of spending conditions,
-and can therefore be easily visualized or serialized as human-readable
-strings.
-
-## High-Level Features
-
-This library supports
-
-* [Output descriptors](https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md)
-including embedded Miniscripts
-* Parsing and serializing descriptors to a human-readable string format
-* Compilation of abstract spending policies to Miniscript (enabled by the
-`compiler` flag)
-* Semantic analysis of Miniscripts and spending policies, with user-defined
-public key types
-* Encoding and decoding Miniscript as Bitcoin Script, given key types that
-are convertible to `bitcoin::PublicKey`
-* Determining satisfiability, and optimal witnesses, for a given descriptor;
-completing an unsigned `bitcoin::TxIn` with appropriate data
-* Determining the specific keys, hash preimages and timelocks used to spend
-coins in a given Bitcoin transaction
-* `no_std` support enabled by disabling the `default-features`. See `embedded/` for an example.
-
-More information can be found in [the documentation](https://docs.rs/miniscript)
-or in [the `examples/` directory](https://github.com/rust-bitcoin/rust-miniscript/tree/master/examples)
-
-## Minimum Supported Rust Version (MSRV)
-
-This library should always compile with any combination of features on **Rust 1.63.0**.
-
-Some dependencies do not play nicely with our MSRV, if you are running the tests
-you may need to pin some dependencies. See `./contrib/pin.sh` for current pinning.
-
-## Contributing
-
-Contributions are generally welcome. If you intend to make larger changes please
-discuss them in an issue before PRing them to avoid duplicate work and
-architectural mismatches. If you have any questions or ideas you want to discuss
-please join us in
-[##miniscript](https://web.libera.chat/?channels=##miniscript) on Libera.
-
-## Benchmarks
-
-We use a custom Rust compiler configuration conditional to guard the bench mark code. To run the
-benchmarks use: `RUSTFLAGS='--cfg=bench' cargo +nightly bench benchmarks`.
-
-
-## Other Resources
-
-An [ANTLR4 grammar](https://github.com/antlr/grammars-v4/tree/master/miniscript) for Miniscript expressions is available in the ANTLR `grammars-v4` repository.
-
-## Release Notes
-
-See [CHANGELOG.md](CHANGELOG.md).
-
-
-## Licensing
-
-The code in this project is licensed under the [Creative Commons CC0 1.0
-Universal license](LICENSE). We use the [SPDX license list](https://spdx.org/licenses/) and [SPDX
-IDs](https://spdx.dev/ids/).
+This repository is archived and has been moved to https://git.rust-bitcoin.org/rust-bitcoin/rust-miniscript/
+