Create PrestaShop.md

Merged documents from https://github.com/btcpayserver/prestashop-plugin/blob/master/CHANGELOG and https://github.com/btcpayserver/prestashop-plugin/blob/master/README.md to make it more user-friendly and at one place. I have not written this. All credits go to the authors of the documentation and contributors.

PrestaShop.md

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+# Prestashop Plugin for BTCPay server, an opensource Payment processor
+
+Warning this is a Beta version. Use it at your own risk.
+
+## Description
+
+A bitcoin payment plugin for PrestaShop using BTCPay server.
+BTCPay Server is a free and open source server for merchants wanting to accept Bitcoin for their business.
+The API is compatible with Bitpay service to allow seamless migration.
+
+BTCPay is design to be easy to deploy on container hosting platform like Azure.
+and if you want, some companies provide hosting services.
+
+# Using the BTCPay plugin for Prestashop
+
+## Prerequisites
+You must have a BTCPay merchant account to use this plugin.
+If you want to test in test mode, just paste an other btcpayserver url with testing port.
+
+## Making a release
+* add Bitpay https://github.com/btcpayserver/php-bitpay-client/tree/master/src/Bitpay into modules/bitpay/lib
+* zip btcpay directory into btcpay.zip
+* add bitcoin icon into Order state configuration / icon !
+
+## Server Requirements
+
++ PrestaShop 1.7
++ PHP 5+
++ Curl PHP Extension
++ JSON PHP Extension
+
+## Plugin Configuration
+
+### For Prestashop versions 1.7:
+1. Download the latest release from https://github.com/adapp-tech/prestashop-plugin/releases
+2. Go to your PrestaShop administration. Under "Modules and services" select "Upload a module" (v1.7)
+3. Go to your "installed modules" -> "BTCPay" and click [Configure]<br />
+4. Go on your BTCPay server, in your store and display access tokens.
+5. Click on "Create a new token API", select your store and then approve
+6. You will see: "Server initiated pairing code: XXXX". Go back to prestashop and enter your pairing code.
+7. Validate.
+8. Test a payment.
+
+# Support
+
+## Tested successfully
+* Prestashop 1.7.x
+* BTCPay server v1.0.1 and v1.0.2
+
+## Contribute
+
+To contribute to this project, please fork and submit a pull request.
+* [GitHub Issues](https://github.com/adapptech/prestashop-plugin/issues)
+
+## PrestaShop Support
+
+* [Homepage](http://www.prestashop.com)
+* [Documentation](http://doc.prestashop.com/)
+* [Support Forums](http://www.prestashop.com/forums/)