Add script to allow installation with pipx

Author: pdecat

pyproject.toml

@@ -2,6 +2,8 @@
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
+[project.scripts]
+jsonata = "jsonata.cli.__main__:main"
 
 [project]
 name = "jsonata-python"