improve README

Author: edwardchalstrey1

README.md

@@ -1,11 +1,11 @@
 # draw_tree
 
-Game tree drawing tool for extensive form games that generates TikZ code, LaTeX documents, PDFs, and PNGs.
+Game tree drawing tool for publication-ready extensive form Game Theory games. Generates TikZ code, LaTeX documents, PDFs, and PNGs.
 
-Pass in an extensive form game file in `.ef` format with layout formatting, and `draw_tree` will generate a visual representation of the game tree.
-You can also pass in a file in `.efg` format, which will be converted to `.ef` internally, applying a default layout.
+- Reads `.ef` format files with layout formatting which can be created via [Game Theory Explorer](https://gametheoryexplorer-a68c7.web.app/). See [specs.pdf](specs.pdf) for details.
+- Also can read `.efg` format generated by [Gambit](https://gambitproject.readthedocs.io/en/stable/), which will be converted to `.ef` internally, applying a default layout before rendering.
 
-⚠️⚠️⚠️ Warning: `draw_tree` is currently in early development. ⚠️⚠️⚠️
+> ⚠️⚠️⚠️ Warning: `draw_tree` is currently in early development. ⚠️⚠️⚠️
 
 > `draw_tree` was originally developed by [Bernhard von Stengel](https://www.lse.ac.uk/people/bernhard-von-stengel) at the London School of Economics. It is being developed further as part of the [Gambit project](https://www.gambit-project.org) out of The Alan Turing Institute.