Added dependencies and CLI function to project, and documented

README.md

@@ -41,6 +41,21 @@ print(f"{n}{km.abbr} in {mile} = {km.to_unit(n, mile)}")
 
 ### CLI
 
+The converter can also be run as a command-line tool.
+Once it's been installed, it can be run in your terminal as:
+
+```bash
+oxrse-unit-conv 42 km mile
+```
+
+Help is available using:
+
+```bash
+oxrse-unit-conv --help
+```
+
+
+
 ## Development
 
 ### Structure

pyproject.toml

@@ -13,11 +13,18 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Operating System :: OS Independent",
 ]
+dependencies = [
+  "click"
+]
+
+[project.scripts]
+oxrse-unit-conv = "oxrse_unit_conv.main:click_convert"
 
 [project.urls]
 "Homepage" = "https://github.com/OxfordRSE/oxrse_unit_conv"
 "Bug Tracker" = "https://github.com/OxfordRSE/oxrse_unit_conv/issues"
 
+
 [build-system]
 requires = ["hatchling"]
-build-backend = "hatchling.build"
+build-backend = "hatchling.build"