update readme

Author: ocots

README.md

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 # Geometric preconditioner for indirect shooting
 
+[ci-img]: https://github.com/control-toolbox/preconditioning/actions/workflows/CI.yml/badge.svg?branch=main
+[ci-url]: https://github.com/control-toolbox/preconditioning/actions/workflows/CI.yml?query=branch%3Amain
+
+[co-img]: https://codecov.io/gh/control-toolbox/preconditioning/branch/main/graph/badge.svg?token=YM5YQQUSO3
+[co-url]: https://codecov.io/gh/control-toolbox/preconditioning
+
+[doc-dev-img]: https://img.shields.io/badge/docs-dev-8A2BE2.svg
+[doc-dev-url]: https://control-toolbox.org/preconditioning/dev/
+
+[doc-stable-img]: https://img.shields.io/badge/docs-stable-blue.svg
+[doc-stable-url]: https://control-toolbox.org/preconditioning/stable/
+
+Geometric preconditioner for indirect shooting
+
+This repo is part of the [control-toolbox ecosystem](https://github.com/control-toolbox). 
+The control-toolbox ecosystem gathers `Julia` packages for mathematical control and applications. The root package is [`OptimalControl.jl`](https://github.com/control-toolbox/OptimalControl.jl) which aims to provide tools to modelise and solve optimal control problems by direct and indirect methods. [![doc OptimalControl.jl](https://img.shields.io/badge/doc-OptimalControl.jl-blue)](http://control-toolbox.org/OptimalControl.jl)
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+| **Documentation**  | **Code Status**  |
+|:-------------------|:-----------------|
+| [![Documentation][doc-stable-img]][doc-stable-url] [![Documentation][doc-dev-img]][doc-dev-url] | [![Build Status][ci-img]][ci-url] [![Covering Status][co-img]][co-url] |