docs: add rstudio docs

docs/ide_integration/r_studio.md

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+# Developing R scripts in RStudio
+
+You can use `pixi` to manage your R dependencies. The conda-forge channel contains a wide range of R packages that can be installed using `pixi`.
+
+## Installing R packages
+
+R packages are usually prefixed with `r-` in the conda-forge channel. To install an R package, you can use the following command:
+
+```bash
+pixi add r-<package-name>
+# for example
+pixi add r-ggplot2
+```
+
+## Using R packages in RStudio
+
+To use the R packages installed by `pixi` in RStudio, you need to set the R interpreter to the one installed by `pixi`. You can do this by setting the `RSTUDIO_WHICH_R` environment variable to the path of the R interpreter installed by `pixi`.
+
+```toml
+[tasks]
+rstudio = "RSTUDIO_WHICH_R=$CONDA_PREFIX/bin/R rstudio"
+```
+
+Now you can run `pixi run rstudio` in your project, and it will launch with the proper R interpreter and the dependencies managed by pixi.
+
+## Full example
+
+Here is an example of a `pixi.toml` file that sets up an RStudio task:
+
+```toml
+[project]
+name = "r"
+version = "0.1.0"
+description = "Add a short description here"
+authors = ["Wolf Vollprecht <wolf@prefix.dev>"]
+channels = ["conda-forge"]
+platforms = ["linux-64", "osx-64", "osx-arm64"]
+
+[target.linux.tasks]
+rstudio = "RSTUDIO_WHICH_R=$CONDA_PREFIX/bin/R rstudio"
+
+[target.macos.tasks]
+rstudio = "RSTUDIO_WHICH_R=$CONDA_PREFIX/bin/R /Applications/RStudio.app/Contents/MacOS/RStudio"
+
+[dependencies]
+r = ">=4.3,<5"
+r-ggplot2 = ">=3.5.0,<3.6"
+```
+
+!!! Note
+    This example assumes that you have installed RStudio system-wide. We are working on updating RStudio as well as the R interpreter builds on Windows for maximum compatibility with `pixi`.