📝 Add some initial docs

Cargo.toml

@@ -5,7 +5,7 @@ categories = ["command-line-utilities"]
 description = "Marktplaats search notifications in Telegram (unofficial)"
 edition = "2021"
 keywords = ["marktplaats", "telegram"]
-license-file = "LICENSE"
+license = "MIT"
 publish = true
 readme = "README.md"
 repository = "https://github.com/eigenein/mrktpltsbot"

README.md

@@ -9,25 +9,38 @@ Self-hosted Marktplaats notifications for Telegram
 ](https://app.codecov.io/gh/eigenein/mrktpltsbot)
 
 > [!CAUTION]
-> This is an **unofficial** bot that **uses unofficial APIs**,
+> This is an **unofficial bot** that **uses unofficial APIs**,
 > so you take all the responsibility for any consequences of running the bot,
 > for example, account or IP bans.
 
 > [!WARNING]
 > The version `2.x` is not well-tested yet.
 
+> [!NOTE]
+> I realize the documentation is not complete – this is not a deliberate choice,
+> but rather the best I could do given the limited resources.
+> I strive to maintain and improve it over time.
+
 ## Installation
 
+`mrktpltsbot` is a single binary which can be installed from [crates.io](https://crates.io/crates/mrktpltsbot):
+
 ```shell
 cargo install mrktpltsbot
 ```
 
-## Running
+## Configuration
+
+`mrktpltsbot` supports conventional CLI options as well as environment variables.
+On launch, it also automatically loads `.env` from the working directory.
 
-> [!NOTE]
-> TODO
+See `mrktpltsbot --help` for the complete list of options,
+including the corresponding environment variable names.
 
-## Configuration
+> [!TIP]
+> Right now, the only required option is a
+> [Telegram bot token](https://core.telegram.org/bots/api#authorizing-your-bot).
 
-> [!NOTE]
-> TODO
+> [!IMPORTANT]
+> `mrktpltsbot` stores all the data in an SQLite database.
+> By default, it creates the database file in the working directory.