[IDP-638] Updating check_only to have specific readme and changelog (DataDog#21109)

* updating check_only to have specific readme and changelog

* adding changelog to datadog_checks_dev

Author: JoshPatel13

datadog_checks_dev/changelog.d/21109.fixed

@@ -0,0 +1 @@
+Updating check_only to not have support_type = 'partner'

datadog_checks_dev/datadog_checks/dev/tooling/create.py

@@ -100,7 +100,7 @@ def construct_template_fields(integration_name, repo_choice, integration_type, *
         install_info = third_party_install_info
         # Static fields
         license_header = ''
-        support_type = 'partner'
+        support_type = ''
         integration_links = ''
     if repo_choice == 'core':
         check_name = normalized_integration_name

datadog_checks_dev/datadog_checks/dev/tooling/templates/integration/check_only/{check_name}/CHANGELOG.md

@@ -0,0 +1,6 @@
+# CHANGELOG - {integration_name}
+
+## 1.0.0 / YYYY-MM-DD
+
+***Added:***
+* Initial Release

datadog_checks_dev/datadog_checks/dev/tooling/templates/integration/check_only/{check_name}/README.md

@@ -0,0 +1,11 @@
+# {integration_name}
+
+## Overview
+This check monitors [integration name] through the Datadog Agent. 
+To learn more, visit https://docs.datadoghq.com/integrations/{integration_name}/
+
+## Setup
+Visit our documentation to learn more. 
+
+## Support
+Need help? Contact Datadog support.