docs: readme update

README.md

@@ -1,29 +1,50 @@
 # Archive Bot
 
-Slack bot helper for managing outdated and very small channels.
+Slack bot helper for managing outdated and very small channels. In its current iteration, it runs
+once and ends, meaning it is meant to be run on a schedule, such as a cron job or a Lambda function.
 
 ## Configuration
 
 Archive bot needs a bit of data to get started:
 
-- Slack API Key
+- Slack [Bot Token](https://api.slack.com/authentication/token-types#bot)
 - Notification [Channel ID](https://github.com/reiniiriarios/archive-bot/#finding-slack-channel-id)
 - Filter Prefixes (optional)
+    - The bot will ignore channels with these prefixes.
 - Messages (optional)
+    - Configure messages to send prefixing updates.
 - Staleness (optional)
+    - Configure how long a channel has to go without a message before it's considered "old."
 - Small Channel Threshold (optional)
+    - Configure how small a channel has to be before it's considered "small."
 
 ```rust
 let config = archive_bot::Config {
+  // Bot tokens look like: xoxb-xxxxxxxyourtokenxxxxxxx.
   token: env::var("SLACK_BOT_TOKEN").expect("Error: environment variable SLACK_BOT_TOKEN is not set."),
+  // Use the channel ID and not the name.
   notification_channel_id: env::var("SLACK_CHANNEL_ID").expect("Error: environment variable SLACK_CHANNEL_ID is not set."),
+  // Ignore channels beginning with these prefixes.
   filter_prefixes: vec!["-"],
+  // Messages to send (one is picked at random).
   message_headers: vec![
     "Hey, you've got some cleaning up to do!",
     "Hey boss, take a look at these, will ya?",
   ],
+  // How long before a channel is stale (in seconds).
   stale_after: 2 * 7 * 24 * 60 * 60,
+  // How small a "small" channel is.
   small_channel_threshold: 3,
+  // Whether to send a secondary notification to a different channel (message only).
+  notify_secondary_channel: true,
+  // The ID of a secondary channel.
+  secondary_notification_channel_id:  env::var("SLACK_CHANNEL_2_ID").expect("Error: environment variable SLACK_CHANNEL_2_ID is not set."),
+  // The message prefix to send to the secondary channel. Will be suffixed with a link to the primary channel.
+  secondary_message_headers: vec![
+    "Hey folks! I, uh... made a list for you. Of channels. That you should archive. Maybe.",
+    "Hey everyone! If you want the satisfaction of crossing a task off your list, I have one!",
+  ],
+  ..archive_bot::Config::default()
 };
 ```
 
@@ -32,7 +53,7 @@ Or, using default values:
 ```rust
 let config = archive_bot::Config {
   token: env::var("SLACK_BOT_TOKEN").expect("Error: environment variable SLACK_BOT_TOKEN is not set."),
-  notification_channel_id: "A01A02A03A04".to_string(),
+  notification_channel_id: "C01A02A03A04".to_string(),
   ..archive_bot::Config::default()
 };
 ```