docs(ai-test): add README (#397)

ai-test/README.md

@@ -0,0 +1,24 @@
+## ai-test
+
+This module allows to gather AI Help answers for quality assurance.
+
+### Quickstart
+
+To understand how this tool works, run: `cargo run -p ai-test -- test --help`
+
+```
+Usage: ai-test test [OPTIONS]
+
+Options:
+  -p, --path <PATH>  
+  -o, --out <OUT>    
+  -h, --help         Print help
+```
+
+For example, to request answers for all questions in the [prompts.yaml](./data/prompts.yaml) file, run (from the repository root):
+
+```sh
+cargo run -p ai-test -- test -p ai-test/data/prompts.yaml
+```
+
+By default, the results are written to the `/tmp/test` directory, unless you specify a different output directory (see above).