Initial commit

Spun out from where I had it previously (a private repo) and tidied the
code up a bit. Included a bit more static analysis courtesy of ruff,
and fixed up the errors. (There weren't many.)

Update README

pyproject.toml

@@ -0,0 +1,58 @@
+[project]
+name = "pdf-decrypt"
+version = "0.1.0"
+description = "Decrypt a PDF using a saved list of passwords."
+readme = "README.md"
+requires-python = ">=3.13"
+dependencies = [
+  "pypdf[full]",
+  "pyyaml",
+]
+
+[build-system]
+requires = [
+	"setuptools>=45",
+]
+build-backend = "setuptools.build_meta"
+
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[project.scripts]
+pdf_decrypt = "pdf_decrypt.pdf_decrypt:main"
+
+[tool.ruff]
+line-length = 120
+indent-width = 2
+
+[tool.ruff.lint]
+select = [
+	"A",
+	"ANN",
+	"B",
+	"BLE",
+	"C4",
+	"E",
+	"EXE",
+	"F",
+	"FURB",
+	"I",
+	"ISC",
+	"N",
+	"PLC",
+	"PLE",
+	"PLR",
+	"PLW",
+	"RUF",
+	"S",
+	"SIM",
+	"TRY",
+	"UP",
+	"W",
+]
+ignore = [
+	# Because I like an indent width of 2 rather than 4
+	"E111",
+	"E114",
+]