update readme.md (#117)

README.md

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 # hip-rs
-A rust wrapper for HIP
+
+[![codecov](https://codecov.io/github/smedegaard/hip-rs/branch/main/graph/badge.svg?token=2J63ET3KII)](https://codecov.io/github/smedegaard/hip-rs)
+
+> [!CAUTION]
+> hip-rs is **not to be used** for anything else that hobby projects.
+
+A rust wrapper for HIP.
+
+> The Heterogeneous-computing Interface for Portability (HIP) API is a C++ runtime API and kernel language that lets developers create portable applications running in heterogeneous systems, using CPUs and AMD GPUs or NVIDIA GPUs from a single source code. HIP provides a simple marshalling language to access either the AMD ROCM back-end, or NVIDIA CUDA back-end, to build and run application kernels.
+> — the [HIP documentation](https://rocm.docs.amd.com/projects/HIP/en/latest/what_is_hip.html)