add: create CHANGELOG.md to document project updates and notable changes

Author: jairomelo

CHANGELOG.md

@@ -0,0 +1,47 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),  
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [1.1.0] – 2025-05-12
+
+### Added
+- Request Methods episode to Interacting with APIs chapter.
+- Introduction to APIs using Postman and The Cat API
+- Hands-on chapters with GET, POST, PATCH, DELETE requests
+- Environment variable setup with secrets
+- New section on working with the **GitHub REST API**, including:
+  - Environment variable setup (`gh_token`, `gh_URL`, `owner`, `repo`)
+  - Token-based authentication via headers
+  - Interactive exercises for:
+    - Retrieving user info (`GET /user`)
+    - Searching repositories (`GET /search/repositories`)
+    - Creating, updating, listing, and unlocking issues (`POST`, `PATCH`, `GET`, `DELETE`)
+- New instructional content on reading and translating **GitHub API documentation** into Postman requests
+- Example visuals for Postman interface, GitHub responses, and Octocat endpoint
+
+### Changed
+- Clarified explanations and formatting in earlier chapters (e.g. Cat API section)
+- Improved consistency in variable usage (`url`, `gh_URL`, `api_token`, etc.)
+
+### Fixed
+- Minor typos and grammatical improvements throughout
+- Corrected outdated references in Postman version and screenshots
+
+---
+
+## [1.0.1] – 2025-02-14
+### Fixed
+- Minor typo corrections and formatting tweaks for clarity
+
+## [1.0.0] – 2025-02-10
+### Added
+- Initial public release
+- What are APIs and why do they exists
+- Interacting with APIs (GET requests) using the Web interface.
+- APIs for Data Analysis
+- A Catalog of APIs