Add poetry config

Currently covers the dependencies used in Marie's Jupyter notebook
and some extra dev tooling. Note that I had an issue using poetry
to install pylode, so I added it to pyproject.toml manually.

pyproject.toml

@@ -0,0 +1,23 @@
+[tool.poetry]
+name = "iseal-schema"
+version = "0.1.0"
+description = "Workflow to process ISEAL schema Excel into RDF and user-facing specification."
+authors = ["Alan Orth <aorth@mjanja.ch>", "Marie-Angelique Laporte <m.a.laporte@cgiar.org>"]
+license = "GPL-3.0-only"
+
+[tool.poetry.dependencies]
+python = "^3.9"
+pandas = "^1.3.4"
+# Explicitly install pylode, which installs rdflib. If we install rdflib first
+# there is currently some kind of dependency issue due to version conflicts.
+pylode = "^2.12.0"
+isort = "^5.9.3"
+black = "^21.9b0"
+openpyxl = "^3.0.9"
+ipykernel = "^6.4.2"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"