chore: Write out JOSS paper and add relevant CI

.Rbuildignore

@@ -18,3 +18,4 @@
 ^codemeta\.json$
 ^CODE_OF_CONDUCT\.md$
 ^CITATION\.cff$
+^paper$

.github/workflows/draft-joss-paper.yml

@@ -0,0 +1,28 @@
+name: Draft JOSS PDF
+on:
+  push:
+    paths:
+      - paper/**
+      - .github/workflows/draft-pdf.yml
+
+jobs:
+  paper:
+    runs-on: ubuntu-latest
+    name: JOSS Paper Draft
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build draft PDF
+        uses: openjournals/openjournals-draft-action@master
+        with:
+          journal: joss
+          # This should be the path to the paper within your repo.
+          paper-path: paper/paper.md
+      - name: Upload
+        uses: actions/upload-artifact@v4
+        with:
+          name: paper
+          # This is the output path where Pandoc will write the compiled
+          # PDF. Note, this should be the same directory as the input
+          # paper.md
+          path: paper/paper.pdf