Added workflow to create JOSS paper

.github/workflows/draft-pdf.yml

@@ -0,0 +1,29 @@
+---
+name: Draft PDF
+on:
+    push:
+        paths:
+            - joss_paper/**
+            - .github/workflows/draft-pdf.yml
+
+jobs:
+    paper:
+        runs-on: ubuntu-latest
+        name: 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: joss_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.pdf