Update README.md

README.md

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-# pytket-ionq
-
-This extension is currently not working and we don't expect it to be available again in the near future. 
-
-[Pytket](https://tket.quantinuum.com/api-docs/index.html) is a python module for interfacing
-with tket, a quantum computing toolkit and optimising compiler developed by Quantinuum.
-
-`pytket-ionq` is an extension to `pytket` that allows `pytket` circuits to be
-executed on IonQ's quantum devices and simulators.
-
-## Getting started
-
-`pytket-ionq` is available for Python 3.8, 3.9 and 3.10, on Linux, MacOS
-and Windows. To install, run:
-
-```shell
-pip install pytket-ionq
-```
-
-This will install `pytket` if it isn't already installed, and add new classes
-and methods into the `pytket.extensions` namespace.
-
-## Bugs, support and feature requests
-
-Please file bugs and feature requests on the Github
-[issue tracker](https://github.com/CQCL/pytket-ionq/issues).
-
-There is also a Slack channel for discussion and support. Click [here](https://tketusers.slack.com/join/shared_invite/zt-18qmsamj9-UqQFVdkRzxnXCcKtcarLRA#/shared-invite/email) to join.
-
-## Development
-
-To install an extension in editable mode, simply change to its subdirectory
-within the `modules` directory, and run:
-
-```shell
-pip install -e .
-```
-
-## Contributing
-
-Pull requests are welcome. To make a PR, first fork the repo, make your proposed
-changes on the `develop` branch, and open a PR from your fork. If it passes
-tests and is accepted after review, it will be merged in.
-
-### Code style
-
-#### Formatting
-
-All code should be formatted using
-[black](https://black.readthedocs.io/en/stable/), with default options. This is
-checked on the CI. The CI is currently using version 20.8b1.
-
-#### Type annotation
-
-On the CI, [mypy](https://mypy.readthedocs.io/en/stable/) is used as a static
-type checker and all submissions must pass its checks. You should therefore run
-`mypy` locally on any changed files before submitting a PR. Because of the way
-extension modules embed themselves into the `pytket` namespace this is a little
-complicated, but it should be sufficient to run the script `modules/mypy-check`
-(passing as a single argument the root directory of the module to test). The
-script requires `mypy` 0.800 or above.
-
-#### Linting
-
-We use [pylint](https://pypi.org/project/pylint/) on the CI to check compliance
-with a set of style requirements (listed in `.pylintrc`). You should run
-`pylint` over any changed files before submitting a PR, to catch any issues.
-
-### Tests
-
-To run the tests for a module:
-
-1. `cd` into that module's `tests` directory;
-2. ensure you have installed `pytest`, `hypothesis`, and any modules listed in
-the `test-requirements.txt` file (all via `pip`);
-3. run `pytest`.
-
-When adding a new feature, please add a test for it. When fixing a bug, please
-add a test that demonstrates the fix.
+**This repository is archived.**