Create CONTRIBUTING.md

CONTRIBUTING.md

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+If you are willing to contribute, first you should know I will love you and the Telegram Bot comunity too.
+
+Other considerations:
+
+- `README.md` is generated by the inline jsdoc with `npm run gen-doc`.
+- Provide tests for your methods. For running tests you need to set some environment variables:
+```bash
+export TEST_TELEGRAM_TOKEN="123456:AAGoASDFJKnlj6uSQLIhjhBgOUY" # Your bot token
+export TEST_USER_ID="66368736" # User wich the bot will send the messages (can be yours ID)
+export TEST_GROUP_ID="-163889657" # A Telegram group which the bot have access
+npm run test
+```
+- The code is transpilled with babel on Git Hook prepublish
+- E=mc²