Create an index/entrypoint file to help navigate all the test plans f…

…or prebuilt rules

x-pack/solutions/security/plugins/security_solution/docs/testing/test_plans/detection_response/prebuilt_rules/prebuilt_rules.md

@@ -0,0 +1,35 @@
+# Test plans for workflows related to prebuilt rules
+
+## Common information
+
+See [common information](./prebuilt_rules_common_info.md) about prebuilt rules, which inclides:
+
+- Overview of our features built around prebuilt rules.
+- Common terminology used in the test plans below.
+- Common assumptions about testing scenarios.
+- And other useful information.
+
+## Test plans
+
+Understand how we distribute prebuilt rules via a Fleet package and how prebuilt rules become available for installation and upgrade in the system.
+
+- [Test plan: prebuilt rules package](./prebuilt_rules_package.md)
+
+Learn how users can install prebuilt rules:
+
+- [Test plan: installing prebuilt rules](./prebuilt_rule_installation.md)
+
+Learn how users can edit and customize prebuilt rules:
+
+- [Test plan: customizing prebuilt rules](./prebuilt_rule_customization.md)
+
+Learn how users can upgrade prebuilt rules:
+
+- [Test plan: upgrading prebuilt rules one-by-one or in bulk without preview](./prebuilt_rule_upgrade_without_preview.md)
+- [Test plan: upgrading prebuilt rules one-by-one with preview](./prebuilt_rule_upgrade_with_preview.md)
+- [Test plan: diff algorithms for upgrading prebuilt rules](./prebuilt_rule_upgrade_diff_algorithms.md)
+
+Learn how users can export and import prebuilt rules:
+
+- [Test plan: exporting prebuilt rules](./prebuilt_rule_export.md)
+- [Test plan: importing prebuilt rules](./prebuilt_rule_import.md)