Added a readme to the Regular Expressions quiz.

Author: eriq-augustine

quizzes/regex/README.md

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+# Regular Expressions Quiz
+
+This is a fully functional quiz about regular expressions.
+This quiz is a companion to the [Regular Expressions Assignment](/assignments/regex).
+
+This quiz also serves as a good demonstration of the [Quiz Composer](https://github.com/edulinq/quiz-composer),
+as it covers all the primary question types.
+
+Questions for this quiz live in the [questions directory](./questions),
+and the quiz itself is represented with the [quiz.json](./quiz.json) file.
+
+A compiled PDF version of the quiz is available as [quiz.pdf](./quiz.pdf).
+
+## Working with the Quiz
+
+There are many things you can do with this quiz using the [Quiz Composer](https://github.com/edulinq/quiz-composer) Python library.
+Here we will highlight a few of the commands.
+See the repository for more specifics.
+
+These commands all assume that you have the Quiz Composer installed
+and are running the commands from this directory.
+
+Compile to HTML:
+```sh
+python3 -m quizcomp.cli.parse.quiz quiz.json --format html > quiz.html
+```
+
+Compile to TeX:
+```sh
+python3 -m quizcomp.cli.parse.quiz quiz.json --format tex > quiz.tex
+```
+
+Create a PDF:
+```sh
+python3 -m quizcomp.cli.pdf.create quiz.json
+```
+
+Upload to Canvas:
+```sh
+python3 -m quizcomp.cli.canvas.upload quiz.json --course <canvas course id> --token <canvas access token>
+```
+
+Upload to GradeScope:
+```sh
+python3 -m quizcomp.cli.gradescope.upload quiz.json --course <course id> --user <username> --pass <password>
+```