Reorder and revamp the documentation

docs/pre-requisite.md

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+# Pre-requisite
+Before running your bot in production you will need to setup few
+external API. In production mode, the bot required valid Bittrex API
+credentials and a Telegram bot (optional but recommended).
+
+## Table of Contents
+- [Setup your Bittrex account](#setup-your-bittrex-account)
+- [Backtesting commands](#setup-your-telegram-bot)
+
+## Setup your Bittrex account
+*To be completed, please feel free to complete this section.*
+
+## Setup your Telegram bot
+The only things you need is a working Telegram bot and its API token.
+Below we explain how to create your Telegram Bot, and how to get your
+Telegram user id.
+
+### 1. Create your instagram bot
+**1.1. Start a chat with https://telegram.me/BotFather**  
+**1.2. Send the message** `/newbot`  
+*BotFather response:*
+```
+Alright, a new bot. How are we going to call it? Please choose a name for your bot.
+```
+**1.3. Choose the public name of your bot (e.g "`Freqtrade bot`")**  
+*BotFather response:*
+```
+Good. Now let's choose a username for your bot. It must end in `bot`. Like this, for example: TetrisBot or tetris_bot.
+```
+**1.4. Choose the name id of your bot (e.g "`My_own_freqtrade_bot`")**  
+**1.5. Father bot will return you the token (API key)**  
+Copy it and keep it you will use it for the config parameter `token`.  
+*BotFather response:*
+```
+Done! Congratulations on your new bot. You will find it at t.me/My_own_freqtrade_bot. You can now add a description, about section and profile picture for your bot, see /help for a list of commands. By the way, when you've finished creating your cool bot, ping our Bot Support if you want a better username for it. Just make sure the bot is fully operational before you do this.
+
+Use this token to access the HTTP API:
+521095879:AAEcEZEL7ADJ56FtG_qD0bQJSKETbXCBCi0
+
+For a description of the Bot API, see this page: https://core.telegram.org/bots/api
+```
+
+### 2. Get your user id
+**2.1. Talk to https://telegram.me/userinfobot**  
+**2.2. Get your "Id", you will use it for the config parameter 
+`chat_id`.**