Add descriptions to examples/README.md
# Examples
Just enter the directory (for example, `cd dialogue_bot`) and execute `cargo run` to run an example. Don't forget to initialise the `TELOXIDE_TOKEN` environmental variable.
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+ - [ping_pong_bot](ping_pong_bot) - Just answers "pong" to each incoming message.
+ - [guess_a_number_bot](guess_a_number_bot) - The "guess a number" game.
+ - [dialogue_bot](dialogue_bot) - Drive a dialogue with a user using a type-safe finite automaton.
+ - [admin_bot](admin_bot) - Shows how to deal with bot's commands.
+ - [multiple_handlers_bot](multiple_handlers_bot) - Shows how multiple dispatcher's handlers relate to each other.
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