Add changelog for 1.0.0-alpha 1

changelog.md

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+# What's new in the Add-On
+
+## GDquest Art tools 1.0 ⚠ alpha
+
+⚠ This release is a Work in Progress. Even if we're careful, new features can have bugs 🐛
+
+### 📘 Tutorials ###
+
+Get started with the add-on and the batch export tools: https://youtu.be/jJE5iqE8Q7c
+
+Updated the plugin's built-in documentation. See [Manual.md](https://github.com/GDquest/GDquest-art-tools/blob/master/gdquest_art_tools/Manual.md)
+
+### 🎥🕺 New features ###
+
+- **Batch export all layers in the background** based on metadata in their name
+  - Scale images on export
+  - Add an empty margin to images
+  - Export individual sprites to precise paths, relative or absolute
+  - Export multiple copies of a layer
+- **Smart batch rename tool** with search and replace to add metadata to many layers at once
+- **Export all selected layers**
+  - The structure of the export folder follows your layer stack