doc: Document data location

ducdetronquito · Jan 14, 2024 · 7654ff5 · 7654ff5
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diff --git a/README.md b/README.md
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 CLI tool to remember birthdays of people you know
 
+## Installation
+
+```shell
+cargo install birthday
+```
+
 ## Usage
 
+Birthdays are stored in a SQLite database located in the [standard data directory](https://dirs.dev/)
+of your OS, but you can also override this behavior by defining a custom path via the `BIRTHDAY_DATA` environment variable. 
+
+
 ```shell
 # Add someone's birthday
 $ birthday add "Ben Dover" 03/05/1990