release: Add release checklist

Signed-off-by: Devaraj Ranganna <devaraj.ranganna@arm.com>

docs/release_checklist.md

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+# Arm FRI Release Checklist
+
+- [ ] Confirm Naming convention and Release Version with AWS
+    - [ ] release date format
+- [ ] Feature Completeness as per AWS FRI Requirements
+- [ ] Passed required tests (Developer tests, in the future replaced with automated CI/CD tests and demo once FreeRTOS qualification/validation 2.0 tests completed)
+    - [ ] network transport interface tests
+    - [ ] corePKCS11 test
+    - [ ] OTA PAL/E2E tests
+    - [ ] Manual tests with key provisioning
+- [ ] Getting Started Guide (Update)
+- [ ] Github doc updates
+    - [ ] ReadMe
+    - [ ] Manifest
+    - [ ] License
+- [ ] [FreeRTOS.org](https://freertos.org/) documentation changes
+    - [ ] Project Introduction Page
+    - [ ] Featured Reference Integration Landing Page (if add or remove project)
+    - [ ] blog (if any)

release_changes/202406121230.change

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+release: Add release checklist