add README.md to the examples directory

examples/README.md

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+# Usage examples
+
+This directory contains examples on how to use the library properly. Currently two examples are available:
+- [Simple Telegram transport (only text messages are supported)](telegram)
+- [MG Webhook processing example](webhooks)
+
+## `telegram`
+
+How to run the example:
+1. Copy `config.json.dist` to `config.json`.
+2. Replace placeholder values in the `config.json` with your data. You'll need a service like ngrok.io for that.
+3. Navigate to `telegram` directory via terminal and run `go run ./...`
+
+The sample will automatically register itself in the target system and will begin transferring the messages between Telegram and MessageGateway.
+
+## `webhook`
+
+You can run this example by executing `go run /...`. Transport API webhooks from MessageGateway should be sent to the `/api/v1/webhook` route.