message: Add recipe for rwn files
  Proposed in
diff: "pdflatex",
  "pdflatex"
  ]
  + },
  + {
  + "name": "Compile Rnw files",
  + "tools": [
  + "rnw2pdf"
  + ]
  }
  ],
  "markdownDescription": "Define LaTeX compiling recipes.\nEach recipe in the list is an object containing its name and the names of tools to be used sequentially, which are defined in `latex-workshop.latex.tools`.\nBy default, the first recipe is used to compile the project. For details, please visit https://github.com/James-Yu/LaTeX-Workshop/wiki/Compile#latex-recipe."
  "%DOCFILE%"
  ],
  "env": {}
  + },
  + {
  + "name": "rnw2pdf",
  + "command": "Rscript",
  + "args": [
  + "-e",
  + "knitr::knit2pdf('%DOCFILE%')"
  + ],
  + "env": {}
  }
  ],
  "markdownDescription": "Define LaTeX compiling tools to be used in recipes.\nEach tool is labeled by its `name`. When invoked, `command` is spawned with arguments defined in `args` and environment variables defined in `env`. Typically no spaces should appear in each argument unless in paths.\nPlaceholders `%DOC%`, `%DOCFILE%`, `%DIR%`, `%TMPDIR%` and `%OUTDIR%` are available. For details, please visit https://github.com/James-Yu/LaTeX-Workshop/wiki/Compile#latex-recipe."
  