add comment for Font.Load

src/Graphics/Font/Font.cs

@@ -16,6 +16,11 @@ namespace MoonWorks.Graphics.Font
 		private byte* StringBytes;
 		private int StringBytesLength;
 
+		/// <summary>
+		/// Loads a TTF or OTF font from a path for use in MSDF rendering.
+		/// Note that there must be an msdf-atlas-gen JSON and image file alongside.
+		/// </summary>
+		/// <returns></returns>
 		public unsafe static Font Load(
 			GraphicsDevice graphicsDevice,
 			CommandBuffer commandBuffer,