Add documentation

docs/operations/data_migration.md

@@ -524,3 +524,31 @@ Example: `cf ssh getgov-za`
 | 2 | **debug**                  | Increases logging detail. Defaults to False.                                |
 | 3 | **limitParse**             | Determines how many domains to parse. Defaults to all.                      |
 | 4 | **disableIdempotentCheck** | Boolean that determines if we should check for idempotence or not. Compares the proposed extension date to the value in TransitionDomains. Defaults to False. |
+
+
+## Populate First Ready
+This section outlines how to run the populate_first_ready script
+
+### Running on sandboxes
+
+#### Step 1: Login to CloudFoundry
+```cf login -a api.fr.cloud.gov --sso```
+
+#### Step 2: SSH into your environment
+```cf ssh getgov-{space}```
+
+Example: `cf ssh getgov-za`
+
+#### Step 3: Create a shell instance
+```/tmp/lifecycle/shell```
+
+#### Step 4: Running the script
+```./manage.py populate_first_ready --debug```
+
+### Running locally
+```docker-compose exec app ./manage.py populate_first_ready --debug```
+
+##### Optional parameters
+|   | Parameter                  | Description                                                                 |
+|:-:|:-------------------------- |:----------------------------------------------------------------------------|
+| 1 | **debug**                  | Increases logging detail. Defaults to False.                                |