Add script to add practice exercise (#565)

Author: ErikSchierboom

building/tooling/best-practices.md

@@ -22,10 +22,12 @@ A very helpful command-line tool is [hyperfine](https://github.com/sharkdp/hyper
 
 Newer track tooling repos will have access to the following two scripts:
 
-1. `./bin/benchmark.sh`: benchmark the track tooling code ([source code](https://github.com/exercism/generic-test-runner/blob/a6886f4d84d2a2030f766a658c334bbfbe97b79c/bin/benchmark.sh))
-2. `./bin/benchmark-in-docker.sh`: benchmark the track tooling Docker image ([source code](https://github.com/exercism/generic-test-runner/blob/a6886f4d84d2a2030f766a658c334bbfbe97b79c/bin/benchmark-in-docker.sh))
+1. `./bin/benchmark.sh`: benchmark the track tooling code ([source code](https://github.com/exercism/generic-test-runner/blob/main/bin/benchmark.sh))
+2. `./bin/benchmark-in-docker.sh`: benchmark the track tooling Docker image ([source code](https://github.com/exercism/generic-test-runner/blob/main/bin/benchmark-in-docker.sh))
 
-If you're working on a track tooling repo without these files, feel free to copy them into your repo.
+```exercism/note
+If you're working on a track tooling repo without these files, feel free to copy them into your repo using the above source links.
+```
 
 ```exercism/caution
 Benchmarking scripts can help estimate the tooling's performance.

building/tracks/new/add-first-exercise.md

@@ -79,15 +79,40 @@ bin/fetch-configlet
 bin/configlet create --practice-exercise hello-world
 ```
 
+### Set author
+
+To have the website list you as the exercise's author, follow these steps:
+
+Within the exercise's `.meta/config.json` file:
+
+- Add your GitHub username to the `authors` key
+
+For this to work, you'll need link your Exercism account to GitHub.
+You can do this on the website in the [Settings page's Integrations section](https://exercism.org/settings/integrations).
+
+```exercism/note
+Exercise authors are also awarded [reputation](/docs/using/product/reputation)
+```
+
+### Use script
+
+Newer track repos can use the `bin/add-practice-exercise` script ([source](https://github.com/exercism/generic-track/blob/main/bin/add-practice-exercise)) to add new exercises:
+
+```shell
+bin/add-exercise -a <github_username> two-fer
+```
+
+```exercism/note
+If you're working on a track repo without this file, feel free to copy them into your repo using the above source link.
+```
+
 ### Implement exercise
 
 Once the scaffolded files have been created, you'll then have to:
 
 - Add tests to the tests file
 - Add an example implementation
 - Define the stub file's contents
-- Within the exercise's `.meta/config.json` file:
-  - Add the GitHub username of the exercise's authors to the `authors` key
 
 #### Add tests
 

building/tracks/new/add-initial-exercises.md

@@ -106,14 +106,21 @@ To make this all a bit more concrete, this is what a sample selection of initial
 ### Scaffold exercise
 
 Having selected the exercises you want include in your track, the next step is to implement them.
-You can quickly scaffold a new Practice Exercise by running the following commands from the track's root directory:
+You can quickly scaffold a new Practice Exercise by running the `bin/add-practice-exercise` script ([source](https://github.com/exercism/generic-track/blob/main/bin/add-practice-exercise)) from the track's root directory:
 
 ```shell
-bin/fetch-configlet
-bin/configlet create --practice-exercise <slug>
+bin/add-exercise <exercise-slug>
 ```
 
-For more information, check the [`configlet create` docs](/docs/building/configlet/create)
+Optionally, you can also specify the exercise's difficulty (via `-d`) and/or author's GitHub username (via `-a`):
+
+```shell
+bin/add-practice-exercise -d 3 -a foobar <exercise-slug>
+```
+
+```exercism/note
+If you're working on a track repo without this file, feel free to copy them into your repo using the above source link.
+```
 
 ### Implement exercise