update readmes

CustomBot/README.md

@@ -1,9 +1,48 @@
 # CustomBot
 
-This bot basically have no any useful behaviour, but you may customize it as a playground
+CustomBot is a diagnostics-heavy playground for experimenting with TelegramBotAPI's behaviour
+builder. It uses long polling, prints the result of `getMe` at startup, logs every received update,
+and prints every Bot API request and result. It is intended as an example to modify, not as a
+production bot.
 
-## Launch
+## Commands and updates
+
+| Command or update | Behaviour |
+| --- | --- |
+| `/start` | Prints the captured update, context data, and `getChat` result. It fetches profile audios for the current private-chat ID in pages of two, replying with one audio or a two-audio playlist for each non-empty page. |
+| `/additional_command` | Demonstrates handler-specific subcontext initialization by storing the command message and printing it with the captured update. It sends no reply. |
+| `/getMyStarBalance` | Replies with the bot's current Telegram Stars balance. |
+| Channel direct-messages configuration changed | Prints the event to standard output. |
+
+The commands take no arguments. Use `/start` in a private chat: the example deliberately uses the
+chat ID as the user ID for `getUserProfileAudios`. No administrator rights are needed for the
+private-chat commands. The channel event is only observable when Telegram delivers that update for
+a channel in which the bot participates.
+
+## Run
+
+Create a bot, obtain its token, and run this command from the repository root:
 
 ```bash
-../gradlew run --args="BOT_TOKEN"
+./gradlew :CustomBot:run --args="<BOT_TOKEN>"
 ```
+
+The token must be the first application argument. Two optional, case-sensitive flags may follow in
+either order:
+
+- `debug` enables TelegramBotAPI library logs on standard output. The bot's explicit request,
+  result, and update logging is active even without this flag.
+- `testServer` selects Telegram's Bot API test environment instead of production.
+
+For example:
+
+```bash
+./gradlew :CustomBot:run --args="<BOT_TOKEN> debug testServer"
+```
+
+## API concepts demonstrated
+
+- Global and handler-specific `BehaviourContextData` initialization.
+- Request/result middleware and subscription to `allUpdatesFlow`.
+- Paginated `getUserProfileAudios` calls and audio/media-group replies.
+- Command and channel-direct-message event handlers.