add scripts/create-migration to contributing docs
@@ -396,10 +396,21 @@ files are created. This is to ensure that the migrations always run in order.
There is a utility provided to generate migration files, located at
`atc/db/migration/cli`.
-To generate a migration:
+To generate a migration, you have two options:
-1. Build the CLI:
+#### The short way
+
+Use the `create-migration` script:
+```sh
+$ ./atc/scripts/create-migration my_migration_name
+# or if you want a go migration,
+$ ./atc/scripts/create-migration my_migration_name go
+```
+
+#### The long way
+
+1. Build the CLI:
```sh
$ cd atc/db/migration
$ go build -o mig ./cli
