docs: add release-notes.

Author: ziggie1984

docs/release-notes/release-notes-0.18.5.md

@@ -1,8 +1,58 @@
-## Bug Fixes
+# Release Notes
+- [Bug Fixes](#bug-fixes)
+- [New Features](#new-features)
+    - [Functional Enhancements](#functional-enhancements)
+    - [RPC Additions](#rpc-additions)
+    - [lncli Additions](#lncli-additions)
+- [Improvements](#improvements)
+    - [Functional Updates](#functional-updates)
+    - [RPC Updates](#rpc-updates)
+    - [lncli Updates](#lncli-updates)
+    - [Breaking Changes](#breaking-changes)
+    - [Performance Improvements](#performance-improvements)
+- [Technical and Architectural Updates](#technical-and-architectural-updates)
+    - [BOLT Spec Updates](#bolt-spec-updates)
+    - [Testing](#testing)
+    - [Database](#database)
+    - [Code Health](#code-health)
+    - [Tooling and Documentation](#tooling-and-documentation)
+
+# Bug Fixes
+
+* [Fixed a bug](https://github.com/lightningnetwork/lnd/pull/9459) where we
+  would not cancel accepted HTLCs on AMP invoices if the whole invoice was
+  canceled.
+
+# New Features
+
+## Functional Enhancements
+
+## RPC Additions
+
+## lncli Additions
+
+
+# Improvements
+## Functional Updates
+## RPC Updates
+
+## lncli Updates
+## Code Health
+## Breaking Changes
+## Performance Improvements
+
+# Technical and Architectural Updates
+## BOLT Spec Updates
+
+## Testing
+## Database
+## Code Health
 
 * [Improved user experience](https://github.com/lightningnetwork/lnd/pull/9454)
  by returning a custom error code when HTLC carries incorrect custom records.
+ 
+## Tooling and Documentation
 
 # Contributors (Alphabetical Order)
 
-* Ziggie
+* Ziggie