Adding longer prompts for all cookiecutter options (#380)

Fixes #296 and fixes #305 

Adds longer human-readable prompts for all cookiecutter template options
using the `prompts` field in `cookiecutter.json` (we already had a
prompt for `deploy_docs_to_github_pages` option from #319).

---------

Co-authored-by: David Stansby <dstansby@gmail.com>

cookiecutter.json

@@ -5,7 +5,7 @@
  "project_name": "Python Template",
  "project_slug": "{{cookiecutter.project_name.lower().replace(' ', '-').replace('_', '-')}}",
  "package_name": "{{cookiecutter.project_slug.replace('-', '_')}}",
- "project_short_description": "A cookiecutter template with ARC recommendations.",
+ "project_short_description": "A cookiecutter package with UCL ARC recommendations.",
  "initialise_git_repository": true,
  "deploy_docs_to_github_pages": false,
  "github_username": "{{cookiecutter.author_given_names.lower().replace(' ', '-')}}-{{cookiecutter.author_family_names.lower().replace(' ', '-')}}",
@@ -14,6 +14,19 @@
  "license": ["MIT", "BSD-3", "GPL-3.0"],
  "funder": "JBFC: The Joe Bloggs Funding Council",
  "__prompts__": {
- "deploy_docs_to_github_pages": "Enable automatically deploying HTML documentation to GitHub Pages website on pushes to main"
+ "author_given_names": "Given name(s) of package author",
+ "author_family_names": "Family name(s) of package author",
+ "author_email": "Email address for package author - will be part of package metadata.",
+ "project_name": "Name of project - may contain spaces",
+ "project_slug": "'Slugified' project name for use in URLs - dash-case recommended",
+ "package_name": "Name for Python package - snake_case recommended",
+ "project_short_description": "Short description of the project",
+ "initialise_git_repository": "Initialise project directory as a Git repository?",
+ "deploy_docs_to_github_pages": "Automatically deploy HTML docs to GitHub Pages on pushes to main?",
+ "github_username": "GitHub user or organization name which will be owner of repository",
+ "min_python_version": "Minimum Python version supported by package",
+ "max_python_version": "Maximum Python version supported by package",
+ "license": "Which open-source license to release package under",
+ "funder": "Organisation(s) to acknowledge for funding of project"
  }
 }