Create RTK Query Code Generator for Open API Changelog (#3798)

* Create ChangeLog.md

Create the initial changelog.

* Add Details as provided by @phryneas

Missed these details while perusing the commits.

Author: elliot-huffman

packages/rtk-query-codegen-openapi/ChangeLog.md

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+# Changelog
+
+All notable changes to the `RTK Query - Code Generator` for `Open API` project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 1.1.3 - 10-11-2023
+
+### Added
+- Adds a temporary workaround for [4.9.0 and 4.10.0 generate circular types oazapfts/oazapfts#491](https://github.com/oazapfts/oazapfts/issues/491)
+
+## 1.1.2 - 10-11-2023
+
+### Added
+- Support for Read Only Properties in the Open API spec. Previously, this property was ignored.   
+  - Now if the readOnly property is present and set to `true` in a schema, it will split the type into two types: one with the read only property suffixed as 'Read' and the other without the read only properties, using the same type name as before.
+  - This may cause issues if you had your OpenAPI spec properly typed/configured, as it will remove the read onyl types from your existing type. You will need to switch to the new type suffixed as 'Read' to avoid missing property names.
+
+## 1.1.1  - 10-11-2023
+
+### Changed
+- Codegen: better handling of duplicate param names ([Codegen: better handling of duplicate param names #3780](https://github.com/reduxjs/redux-toolkit/pull/3780))
+  - If a parameter name is both used in a query and a parameter, it will be prefixed with `query`/`param` now to avoid conflicts
+
+## 1.1.0  - 10-11-2023
+
+### Added
+- Option of generating real TS enums instead of string unions [Adds the option of generating real TS enums instead of string unions #2854](https://github.com/reduxjs/redux-toolkit/pull/2854)
+- Compatibility with TypeScript 5.x versions as the codegen relies on the TypeScript AST for code generation
+  - As a result also needs a higher TypeScript version to work with (old version range was 4.1-4.5)
+- Changes depenendcy from a temporarily patched old version of `oazapfts` back to the current upstream version