Added readme, removed thread sleep in render loop

Core/Window.cs

@@ -68,7 +68,6 @@ namespace Voxel.Core
             Renderer.Render();
 
             SwapBuffers();
-            Thread.Sleep(5);
         }
 
         protected override void OnFramebufferResize(FramebufferResizeEventArgs e)

README.md

@@ -0,0 +1,18 @@
+# Voxel Engine Reference
+
+C# / OpenTK 4 Voxel Engine (Minecraft clone). 
+
+## Core Systems
+- **Rendering**: SSBO-based (Shader Storage Buffer Objects) for packed face data and GPU meshing.
+- **Data**: 1D Flat arrays for blocks, bitwise indexing for speed.
+- **Updates**: Dirty-flagging for chunk and neighbor mesh rebuilding.
+
+## Key Links
+- [Collision & AABB](https://medium.com/@andrebluntindie/3d-aabb-collision-detection-and-resolution-for-voxel-games-5fcbfdb8cdb4) - Voxel-specific physics resolution.
+- [Minecraft Jump Physics](https://www.mcpk.wiki/wiki/Jumping) - Movement constants and logic.
+- [OpenTK Learn](https://opentk.net/learn/) - OpenGL bindings and setup.
+
+## Performance Notes
+- Use `UpdateNeighborsAtBoundary` to mark adjacent chunks dirty.
+- Call `RebuildDirtyChunks` at the end of the update loop.
+- Avoid per-block `GL.BufferSubData` calls, batch into one SSBO update.