Added a sample map and questions.

Modified SVGMap to size icons relative to viewport em units instead of the SVG's coordinate system.
Modified doors mapper to size the line thickness relative to the viewport units instead of the SVG's coordinate system.
Added a link to my coursework in the README.

README.md

@@ -1,8 +1,9 @@
 Definition Dash is the project I did for my A Level Computer Science coursework (OCR Component 3).
 
-I will soon be providing:
-- more details about what the project is
-- my coursework document (filtered to not include anything about my school)
-- a sample map
-- sample questions
-After which I will be working on making a publicly accessible version of the game for everyone to try out!
+If you're curious to see my coursework document, you can find it [here](https://drive.google.com/drive/folders/1TZDMiR4YFmcoBMSbNe27Hw3MF8uMsO2e?usp=drive_link).
+I used my actual college's map to test the project while I was working on it for the coursework so, to protect my privacy, some parts of the document have had to be redacted.
+
+If you would like to test the project yourself, I have produced a new sample map (not based on any existing map) in the `sample-data` folder.
+You can follow the same usage instructions provided in the document and corresponding videos.
+
+Once I have produced the terms of use and privacy policy, I will also host a publicly accessible version of the project.