Update and rename README.rst to README.md

Author: victorgodinho-meli

README.md

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+# Mercado Pago SDK for Python
+
+[![PyPI](https://img.shields.io/pypi/v/mercadopago.svg)](https://pypi.python.org/pypi/mercadopago)
+
+## 💡 Requirements
+
+Python 2 or major
+
+## 📲 Installation 
+
+First time using Mercado Pago? Create your [Mercado Pago account](https://www.mercadopago.com), if you don’t have one already.
+
+**On Python 2.x**
+
+`pip install mercadopago`
+
+**On Python 3.x**
+
+`pip3 install mercadopago`
+
+Copy the access_token in the [credentials](https://www.mercadopago.com/mlb/account/credentials) section of the page and replace YOUR_ACCESS_TOKEN with it.
+
+Thats all, you have Mercado Pago SDK installed.
+
+## 🌟 Getting Started
+
+  Simple usage looks like:
+  
+::
+    def index(req, **kwargs):
+        preference = {
+            "items": [
+                {
+                    "title": "Test",
+                    "quantity": 1,
+                    "currency_id": "USD",
+                    "unit_price": 10.4
+                }
+            ]
+        }
+
+        preferenceResult = mp.create_preference(preference)
+
+## 📚 Documentation 
+
+See our Documentation with all APIs you can integrate in our DevSite: [Spanish](https://www.mercadopago.com.ar/developers/es/guides/payments/api/introduction/) / [Portuguese](https://www.mercadopago.com.br/developers/pt/guides/payments/api/introduction/)
+
+Check our official code reference to explore all available functionalities.
+
+## ❤️ Support 
+
+If you require technical support, please contact our support team at [developers.mercadopago.com](https://developers.mercadopago.com)
+
+## 🏻 License 
+
+```
+MIT license. Copyright (c) 2018 - Mercado Pago / Mercado Libre 
+For more information, see the LICENSE file.
+```