add READMEs and screenshots for examples

README.md

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+# libretrogd
+
+Rust library / mini-framework for "retro-style" games development.
+
+This is a not-so-serious project of mine for hobbyist game dev efforts of my own with some silly DOS-inspired
+limitations built in. The major one being that graphics are limited to 256 colours, like DOS VGA mode 13h, with a
+similar low-resolution.
+
+See the `/examples` directory for some demo apps. These will be added to over time.
+
+---
+
+**This is FAR from finished and is not really what I'd consider "production-ready" ... and it probably won't be at any
+point in the near future.**
+
+This project is one I started working on to help teach myself Rust and to get more comfortable working with it. As such,
+there is almost certainly a lot of bad code in here!

examples/balls/README.md

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+# libretrogd - 'Flying Balls' Demo
+
+Just a silly demo. Very minimal.
+
+Simply do `cargo run` from this directory to try it out.
+
+![](screenshot.png)

examples/balls_v2/README.md

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+# libretrogd - 'Flying Balls' Demo v2
+
+Extension of the original 'Flying Balls' demo found in this repository under `/examples/balls`. This one is re-done
+with some more effects, but with the major difference being utilization of the entity, events, and states support from
+libretrogd.
+
+Simply do `cargo run` from this directory to try it out.
+
+![](screenshot.png)

examples/slimed/README.md

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+# libretrogd - 'Slime Stabbing Simulator' Demo
+
+A fairly more involved demo which was originally written to test out and learn how good/bad libretrogd's entity,
+events and state management support is to use in practice. I learnt a lot from it, and have many ideas to improve 
+things now.
+
+**Warning! There is quite a bunch of slow/sloppy code in here!**
+
+Simply do `cargo run` from this directory to try it out.
+
+![](screenshot.png)