docs: add docs for example data and print format

docs/version-13/exampledata.md

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+# Using the Example Data to Experiment with Check Run
+
+The Check Run application comes with a `test_setup.py` script that is completely optional to use. If you execute the script, it populates your ERPNext site with demo business data for a fictitious company called Chelsea Fruit Co. The data enable you to experiment with and test the Check Run application's functionality before installing the app into your ERPNext site.
+
+It's recommended to install the demo data into its own site to avoid potential interference with the configuration or data in your organization's ERPNext site.
+
+With `bench start` running in the background, run the following command to install the demo data:
+
+```shell
+bench execute 'check_run.test_setup.before_test'
+```
+
+Refer to the [installation guide](./installationguide.md) for detailed instructions for how to set up a bench, a new site, and installing ERPNext and the Check Run application.

docs/version-13/exampleprint.md

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+# Example Print Format: Voucher Check
+
+[TODO]
+
+To take advantage of Check Run's check printing functionality, [there must be a print format set up in ERPNext]. Print formats are as unique as the entities using ERPNext, so this voucher check print format serves as an example template. It can be a starting point from which to customize to suit your organization's needs.