Created Getting Started (markdown)

Getting-Started.md

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+This section provides all the information you need to start using Pyrogram. There are a few steps you have to follow before you can use the library to make API calls.
+
+## API Keys
+
+The very first step requires you to obtain a valid Telegram API key. If you already have one you can skip this, otherwise:
+
+1. Visit https://my.telegram.org/apps and log in with your Telegram Account.
+2. Fill out the form to register a new Telegram application.
+3. Done. The Telegram API key consists of two parts: the **App api_id** and the **App api_hash**.
+
+**Important:** This key should be kept secret.
+
+## Setup
+
+Create a new `config.ini` file at the root of your working directory, paste the following and replace the **api_id** and **api_hash** values with [your own](#api-keys):
+
+``` ini
+[pyrogram]
+api_id = 12345
+api_hash = 0123456789abcdef0123456789abcdef
+```
+
+## Authorization
+
+Telegram requires that users be authorized in order to use the API. Pyrogram automatically manages this access, all you need to do is create an instance of the `pyrogram.Client` class by passing to it a `session_name` of your choice and call the `start` method:
+
+``` python
+from pyrogram import Client
+
+client = Client(session_name="example")
+client.start()
+```
+
+This starts an interactive shell asking you to input your **phone number** (including your [Country Code](https://en.wikipedia.org/wiki/List_of_country_calling_codes)) and the **phone code** you will receive:
+
+```
+Enter phone number: +39**********
+Is "+39**********" correct? (y/n): y
+Enter phone code: 32768
+```
+
+After successfully authorizing yourself, a new file called `example.session` will be created allowing Pyrogram executing API calls with your identity.
+
+**Important:** The `*.session` file must be kept secret.
+
+**Note:** The authorization process is executed only once. However, the code above is always required; as soon as a valid session file exists, Pyrogram will use that and won't ask you to enter your phone number again when you restart your script.