Update documentation

README.md

@@ -6,23 +6,35 @@ generate and maintain [Elo ratings](https://wikipedia.org/wiki/Elo_rating_system
 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.
 
-> **Note**<br>
+> **Warning**<br>
 > StartGGElo is still under development; currently, it only supports generating player ratings.
 
 ## Installation
 
-TODO
+*For more information, see the [installation page](INSTALL.md).*
+
+Build and install StartGGElo using `cargo`:
+
+``` sh
+cargo install --git https://github.com/kiana-S/StartGGElo
+```
+
+Alternatively, if you use Nix:
+
+``` sh
+nix profile install github:kiana-S/StartGGElo
+```
 
 ## Configuration
 
-StartGGElo stores its rating database in its config directory, which is located at:
+StartGGElo stores its rating databases in its config directory, which is located at:
 
 - Windows: `%APPDATA%\Roaming\ggelo`
 - MacOS: `~/Library/Application Support/ggelo`
 - Linux: `~/.config/ggelo`
 
 This directory also contains StartGGElo's config file, which defines how it calculates its ratings.
-There are few reasons to access this directory directory, but you can if you want to transfer your
+There are few reasons to access this directory directly, but you can if you want to transfer your
 data between computers.
 
 ## Elo system basics