Switch pixl_dcmd from setup.py to pyproject.toml

Describe project and runtime, dev and test dependencies in pyproject.toml.
Removed requirements.txt and setup.py.  Updated README.md to reflect new
installation procedure.

pixl_dcmd/README.md

@@ -8,15 +8,7 @@ and persisting it in the PIXL postgres database.
 Install the Python dependencies with
 
 ```bash
-pip install -e ../../pixl_core/ .
-```
-
-```bash
-pip install -r requirements.txt
-```
-
-```bash
-pip install -e .
+pip install -e ../pixl_core/ .[test,dev]
 ```
 
 ## Test

pixl_dcmd/pyproject.toml

@@ -0,0 +1,42 @@
+[project]
+name = "pixl_dcmd"
+version = "0.0.2"
+authors = [
+    { name="PIXL authors" },
+]
+description = "DICOM header anonymisation functions"
+readme = "README.md"
+requires-python = "~=3.9"
+classifiers = [
+    "Programming Language :: Python :: 3"
+]
+dependencies = [
+    "arrow==1.2.3",
+    "pydicom==2.4.4",
+    "pydicom-data",
+    "logger==1.4",
+    "pyyaml==6.0",
+    "requests==2.31.0",
+    "python-decouple==3.6",
+    "types-requests~=2.28",
+]
+
+[project.optional-dependencies]
+test = [
+    "pytest==7.4.2",
+]
+dev = [
+    "mypy",
+    "pre-commit",
+    "ruff"
+]
+
+[build-system]
+requires = ["setuptools>=61.0"]
+build-backend = "setuptools.build_meta"
+
+[tool.ruff]
+extend = "./ruff.toml"
+
+[tool.ruff.extend-per-file-ignores]
+"./tests/**" = ["D100"]