Add support for scanning parentheses in stage description and tests.

Author: rohitpaulk

course-definition.yml

@@ -223,18 +223,39 @@ stages:
 
     # The instructions for your stage. Markdown supported. Shown on the course page.
     description_md: |-
-      In this stage, we'll do XYZ
+      In this stage, you'll add support for scanning parentheses (`(` and `)`).
 
-      **Example:** ABC
+      ### Book references
 
-      Your program will be executed like this:
+      - This stage is part of the [Scanning](https://craftinginterpreters.com/scanning.html) chapter.
+      - The code for this stage is implemented in [Section 4.2: Recognizing Lexemes](https://craftinginterpreters.com/scanning.html#recognizing-lexemes).
+
+      ### Tests
+
+      The tester will run a series of tests with `test.lox` files that contain parentheses.
+
+      For example, if `test.lox` contains the following:
+
+      ```bash
+      (()
+      ```
+
+      The tester will run your program like this:
 
       ```bash
-      $ echo "apple" | ./your_executable.sh -E "a"
+      $ ./your_program.sh tokenize test.lox
+      LEFT_PAREN ( null
+      LEFT_PAREN ( null
+      RIGHT_PAREN ) null
+      EOF  null
       ```
 
-      You program must ABCD.
+      The tester will assert that the stdout output matches the format above.
+
+      ### Notes
+
+      - This output format matches the spec in the [book's repository](https://github.com/munificent/craftinginterpreters/tree/01e6f5b8f3e5dfa65674c2f9cf4700d73ab41cf8/test/scanning)
 
     # A description of this stage that is used on the course overview page and other marketing material. Markdown supported.
     marketing_md: |-
-      In this stage, we'll do XYZ.
+      In this stage, you'll implement support for scanning parentheses.