Adding tutorial on setting up package using template (#418)

Would potentially resolve #205 

This adds a lightly edited (mainly removing references to workshop)
version of the tutorial we used in the _Festival of Digital Research &
Scholarship_ workshop to the top-level of the repository along with some
linking text to tutorial in `README.md`.

I also made a few small fixes to existing set up instructions in
`README.md` that I noticed while adding link to tutorial.

---------

Co-authored-by: Patrick J. Roddy <[email protected]>
Co-authored-by: Sam Cunliffe <[email protected]>

README.md

@@ -68,6 +68,11 @@ Python packages with our recommended tooling set up and ready to go.
 
 ## Using this template
 
+Some quick instructions for using our template are below.
+We also have a detailed [tutorial](tutorial.md) that has been given in a couple of workshops geared towards researchers at UCL.
+The tutorial goes into much more pedagogical detail, it both describes using the template to create a package
+and how to use the newly created package with some of the tools included.
+
 1.  Install [cookiecutter] in a Conda or `venv` environment (commented lines for
     Conda example).
 
@@ -88,7 +93,7 @@ Python packages with our recommended tooling set up and ready to go.
     cookiecutter /path/to/your/checkout/of/python-tooling
     ```
 3.  A series of questions will pop up to configure the project. Type the answer
-    or hit return to use the default option (shown in square brackets).
+    or hit return to use the default option (shown in parenthesis).
 
     Note that these project variables are defined in the `cookiecutter.json`
     file.
@@ -100,6 +105,7 @@ Python packages with our recommended tooling set up and ready to go.
     ```
     project_name [Python Template]: PROJECT_NAME
     project_slug [python-template]: PROJECT_SLUG
+    package_name [python_template]: PACKAGE_NAME
     ```
 
     we will get a project folder named `PROJECT_SLUG`, structured like this:
@@ -110,8 +116,8 @@ Python packages with our recommended tooling set up and ready to go.
     ├── README.md
     ├── pyproject.toml
     ├── src
-    │   └── PROJECT_SLUG
-    │       └── PROJECT_SLUG.py
+    │   └── PACKAGE_NAME
+    │       └── __init__.py
     └── tests
         └── test_dummy.py
     ```
@@ -125,7 +131,7 @@ Python packages with our recommended tooling set up and ready to go.
     ...
     ```
 
-5.  To work on your project, initialise a git repository and _install_ it in
+5.  To work on your project, initialise a Git repository and _install_ it in
     editable mode.
     ```
     cd PROJECT_SLUG

docs/pages/templates.md

@@ -12,6 +12,9 @@ The [UCL-ARC/python-tooling](https://github.com/UCL-ARC/python-tooling)
 repository contains our recommended package template for new ARC projects. It
 pre-configures the recommended tools listed in the other pages of this site. If
 you are working on a new project, our template should be a good starting point!
+We have a [tutorial](https://github.com/UCL-ARC/python-tooling/blob/main/tutorial.md)
+available with detailed instructions for creating a package using the template
+and how to use the newly created package with some of the tools included.
 
 If you're making a package for a community that already has a template in
 general use (some examples are listed below) we recommend using their template