add GX-AC paper draft

.github/workflows/joss-AnalyticContinuation-pdf.yml

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+on: [push]
+
+jobs:
+  paper:
+    runs-on: ubuntu-latest
+    name: AnalyticContinuation Paper
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - 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/analyticcontinuation/paper.md
+      - name: Upload
+        uses: actions/upload-artifact@v3
+        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: JOSS/analyticcontinuation/paper.pdf

JOSS/analyticcontinuation/README.md

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+# Compiling the JOSS Paper
+
+To build the paper with [pandoc](https://pandoc.org/installing.html) (3.0.1):
+
+```shell
+pandoc --citeproc --bibliography=refs.bib -s paper.md -o gx_ac.pdf --template latex.template
+```
+
+with a latex templated sourced from a Github [source]( https://github.com/Wandmalfarbe/pandoc-latex-template/blob/master/eisvogel.tex)
+rather than the [JOSS template](https://github.com/sigsep/open-unmix-paper-joss/blob/master/latex.template).