Add changelog (#139)

* Add changelog to CLI

* Bump version in changelog

Author: FabioRosado

CHANGELOG.md

@@ -0,0 +1,27 @@
+# Changelog
+
+All notable changes to the PyScript CLI will be documented in this file, with the latest release at the top.
+
+## [0.3.0] - 2023-03-06
+
+*A lot has changed between 0.2.5 and 0.3.6. This is a summary of the most important changes.*
+
+### Features
+
+- New command `run` to run a local server which serves the current directory.
+  - Added the right CORS headers to the server running locally
+  - Added no-cache headers to the server running locally to avoid caching issues while developing
+
+
+## Improvements
+
+- Allow users to specify an empty author name, email and app description when running `pyscript create`
+- Merged `wrap` command into `create` command, so now `pyscript create` can create a new project or wrap an existing python file into a new pyscript project.
+- The `pyscript create` command now prompts for a name if the name is not provided as an argument.
+- You can now pass a single Python file to `pyscript create` and it will create a new project with the file's contents in the new `main.py` file - similar to using the `--wrap` option.
+
+### Documentation
+
+- Various improvements to the `README.md` files
+- Added `CONTRIBUTING.md` file with information on how to contribute to the project and installing the development environment.
+- Added `CHANGELOG.md` file to keep track of the changes in the project.