Add changelog for the 1.0.0 release

CHANGELOG.md

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+# Changelog #
+
+This document lists new features, improvements, changes, and bug fixes in every release of the add-on.
+
+## Godot Steering Toolkit 1.0.0 ##
+
+This is the first major release of the framework. It comes with:
+
+- All the essential steering behaviors: `Arrive`, `AvoidCollisions`, `Blend`, `Cohesion`, `Evade`, `Face`, `Flee`, `FollowPath`, `LookWhereYouGo`, `MatchOrientation`, `Priority`, `Pursue`, `Seek`, `Separation`.
+- Group behaviors and detecting neighbors.
+- Blending and prioritized behaviors.
+- Specialized types to code agents based on physics bodies:
+    - For 2D games, `KinematicBody2DAgent` and `RigidBody2DAgent`.
+    - For 3D games, `KinematicBody3DAgent` and `RigidBody3DAgent`.
+- 9 Godot demos to learn straight from the code.
+
+### Manual ###
+
+To get started, check out the framework's [manual](https://www.gdquest.com/docs/godot-steering-toolkit/).
+
+There, you can also find the full [code reference](https://www.gdquest.com/docs/godot-steering-toolkit/reference/).
+
+*Note*: we generate the code reference from docstrings in the source code with [GDScript Docs Maker](https://github.com/GDQuest/gdscript-docs-maker).
+