Update contributing instructions

README.md

@@ -46,6 +46,7 @@ Here are just a few of the things that nvcc4jupyter does well:
 
   - [Easily run CUDA C++ code](https://nvcc4jupyter.readthedocs.io/en/latest/usage.html#hello-world)
   - [Profile your code with NVIDIA Nsight Compute](https://nvcc4jupyter.readthedocs.io/en/latest/usage.html#profiling)
+  - [Compile your code with external libraries (e.g. OpenCV)](https://nvcc4jupyter.readthedocs.io/en/latest/notebooks.html#compiling-with-external-libraries)
   - [Share code between different programs in the same notebook / split your code into multiple files for improved readability](https://nvcc4jupyter.readthedocs.io/en/latest/usage.html#groups)
 
 ## Install
@@ -88,13 +89,14 @@ The official documentation is hosted on [readthedocs](https://nvcc4jupyter.readt
 
 ## Contributing
 
-Install the package with the development dependencies:
-```bash
-pip install .[dev]
-```
+The recommended setup for development is using the devcontainer in GitHub
+Codespaces or locally in VSCode.
 
-As a developer, make sure you install the pre-commit hook before commiting any changes:
+If not using the devcontainer you need to install the package with the
+development dependencies and install the pre-commit hook before commiting any
+changes:
 ```bash
+pip install .[dev]
 pre-commit install
 ```