Update install instructions

README.md

@@ -8,13 +8,28 @@ Thing Description at the camera's root (usually `/camera/`).
 
 ## Installation
 
-The package is on PyPI and can be installed using `pip install labthings-picamera2`. Note that
-you may need to separately install `pip install labthings-fastapi[server]`. The package
-can also be installed from a clone of this repository with `pip install -e .`.
+For this to work you should be on a 32-bit version of Bullseye or Bookworm os with python v3.9 or 3.11.
 
 It's usually best to install in a virtual environment, but note that you should use
-`python -m venv .venv --system-site-packages` as the `picamera2` package and its 
-dependencies are not all installable using `pip`.
+
+    python -m venv .venv --system-site-packages
+
+as the `picamera2` package and its dependencies are not all installable using `pip`.
+
+The package is on PyPI and can be installed using
+
+    pip install labthings-picamera2
+
+You will also need to separately install the server with:
+
+    pip install labthings-fastapi[server]
+
+
+If you want to edit labthings-picamera2 then you can clone this repository. Move to the directory and run
+
+    pip install -e .
+
+
 
 ## Usage
 
@@ -46,4 +61,4 @@ All of the properties and actions described in the Thing Description should be p
 Python properties and methods - currently the types and docstrings don't propagate to the
 client object, this is planned for the future but isn't reality yet.
 
-[labthings-fastapi]: https://github.com/labthings/labthings-fastapi/
+[labthings-fastapi]: https://github.com/labthings/labthings-fastapi/