Add DocFX documentation.

TODO.md

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+# Voile MVP
+
+## Core
+
+- ~~Add and implement interfaces for systems (ISystem, IUpdatableSystem, etc.)~~
+- Minimize amount of possible null references.
+- Serialization and deserialization of Resources from and to TOML files.
+- Add documentation for common classes.
+- Hot reloading of resources.
+
+## I/O
+
+- Use GUIDs and string ID maps for fetching resources instead of string IDs alone.
+- (stretch goal) Make async API for ResourceManager
+- (stretch goal/1.0) Streamed resource loading
+- (stretch goal) Virtual file system
+
+## Serialization
+
+- Serialize attribute.
+- Add automatic serialization of resources through code generation and System.Text.Json.
+- Provide means for fetching key/value configuration (INI? TOML?)
+  - Expose some sort of ConfigFile class for safe key/value configuration fetching.
+
+## Rendering
+
+- ~~API for drawing textured quads~~
+- ~~Camera API~~
+- Arbitrary mesh rendering API.
+- (1.0) Create WebGPU renderer (StandardRenderer)
+
+## Audio
+
+- ~~Integrate FMOD~~
+- 2D audio abstraction
+
+## Misc
+
+- ~~Asset manager~~
+- ~~Separate engine and game into separate projects~~
+- ~~Particle system~~
+
+## SceneGraph module
+
+- ~~Layers (sorting mechanism)~~
+- Full overhaul using Entity Component architecture (not to be mistaken with ECS).
+- Save/load scenes from file
+
+## Input
+
+- ~~Action system~~
+- Make action system use an InputMap resource instead.
+- Gamepad support
+
+## UI
+
+- Immediate mode API.
+- Styling.
+- Basic input elements (button, text field, toggle).
+- Containers (vertical and horizontal).