Update README with info about framebuffer changes

README.md

@@ -5,14 +5,14 @@ Texas Instruments TMS9918A VDP emulator library for Rust
 
 ![TMS9918A](https://upload.wikimedia.org/wikipedia/commons/d/de/TMS9918A_02.jpg)
 
-tms9918a_emu uses the [minifb](https://github.com/emoon/rust_minifb) crate to emulate a [Texas Instruments TMS9918A](https://en.wikipedia.org/wiki/Texas_Instruments_TMS9918) video display processor in a window.
+tms9918a_emu emulates a [Texas Instruments TMS9918A](https://en.wikipedia.org/wiki/Texas_Instruments_TMS9918) video display processor and provides a basic framebuffer as `Vec<u32>` which can be used with other creates, such as [minifb](https://github.com/emoon/rust_minifb), to create a window.
 
 High-level functions are provided as well as low-level functions, making it easy to control the VDP without needing to use the control and data ports.
 
 This emulator is a work-in-progress and currently only supports the Graphics I and Text video modes, and sprites are unsupported in all modes. In its current state, this emulator is more of a TMS9918 (non-A variant) emulator.
 
 ## Example
-This is a small [example program](examples/high_level_text/src/main.rs) which uses Text mode to display a hello world message, showing how to use the high-level functions:
+This is a small [example program](examples/high_level_text/src/main.rs) which uses Text mode to display a hello world message in a minifb window, showing how to use the high-level functions:
 ![High-level Text mode example](examples/high_level_text/images/screenshot.png)
 
 A similar [example program](examples/low_level_text/src/main.rs) is available which shows how to use the low-level functions to display the same hello world message.