README.md in trackler-2.0.0.6

- old
+ new
@@ -16,9 +16,34 @@
 Run single assignments with:
 ```bash
 $ make test-assignment ASSIGNMENT=test-folder-name
 ```
 
+## The Test Generator
+
+### Creating a New Generator
+
+Navigate to `src/generator/exercises` and create a new generator file (i.e. `hello_world.cr`).
+
+This file should contain 2 classes:
+* An exercise generator which must inherit from the ExerciseGenerator class.
+* A test case class which inherits from ExerciseTestCase.
+
+The x-common repo must reside at the same level as the developer's crystal directory, and must contain a canonical-data.json file for the given exercise.
+
+### Running the Generator
+
+From within the xcrystal directory:
+```bash
+$ crystal src/generator/generate.cr hello-world
+```
+
+Or build a binary:
+```bash
+$ make build_generator
+$ bin/generate hello-world
+```
+
 ## Contributing Guide
 
 Please see the [contributing guide](https://github.com/exercism/x-api/blob/master/CONTRIBUTING.md#the-exercise-data)
 
 ## License