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README.md

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+# StartGGElo
+
+StartGGElo is a tool for using [start.gg](https://www.start.gg/)'s video game tournament data to
+generate and maintain [Elo ratings](https://wikipedia.org/wiki/Elo_rating_system) for each competitive player.
+
+Once Elo ratings are generated, StartGGElo can be used to generate ranking lists, predict the
+probability of a player winning a match, generate seedings for future tournaments, and more.
+
+## Installation
+
+TODO
+
+## Configuration
+
+StartGGElo stores its rating database in its config directory, which is located at:
+
+- Windows: `%APPDATA%\Roaming\ggelo`
+- Mac/Linux: `~/.config/ggelo` or `~/.ggelo`
+
+This directory also contains StartGGElo's config file, which defines how it calculates its ratings.
+
+## Elo system basics
+
+*For more information on StartGGElo's rating system, see the [details page](DETAILS.md).*
+
+As the name implies, StartGGElo uses the Elo system for its ratings. In the Elo system, all newcomers to the
+game are assigned an **initial rating**, and this rating is adjusted whenever a player loses or wins matches.
+The initial rating for StartGGElo is 1500, but this is configurable.
+
+Whenever a player enters a tournament, StartGGElo will use start.gg's API to determine how many sets
+that player won within that tournament. This number is the player's **score** for that tournament. If the score
+the player earned is larger than their Elo rating would predict, then their rating is increased.