Update README.md

Author: foldfelis

README.md

@@ -1 +1,15 @@
 # NeuralOperators
+
+## Source code status
+
+| **Documentation** | **Build Status** |
+|:-----------------:|:----------------:|
+| [![doc dev badge]][doc dev link] | [![ci badge]][ci link] [![codecov badge]][codecov link] |
+
+[doc dev badge]: https://img.shields.io/badge/docs-dev-blue.svg
+[doc dev link]: https://foldfelis.github.io/NeuralOperators.jl//dev
+
+[ci badge]: https://github.com/foldfelis/NeuralOperators.jl/actions/workflows/CI.yml/badge.svg
+[ci link]: https://github.com/foldfelis/NeuralOperators.jl/actions/workflows/CI.yml
+[codecov badge]: https://codecov.io/gh/foldfelis/NeuralOperators.jl/branch/master/graph/badge.svg?token=JQH3MP1Y9R
+[codecov link]: https://codecov.io/gh/foldfelis/NeuralOperators.jl