Improvements (#6)

* Add external dependencies to manifest to avoid error on module activation; add requirements.txt.
* Readme 
* Fix errors, restructure settings form, update installation steps, streamline overall.
* Change version

payment_btcpay/data/payment_provider_data.xml

@@ -1,11 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <odoo noupdate="1">
+
     <record id="payment_provider_btcpay" model="payment.provider">
-        <field name="name">BTCPay</field>
+        <field name="name">BTCPay payments</field>
+        <field name="display_as">Pay with Bitcoin / Lightning Network</field>
         <field name="code">btcpay</field>
         <field name="image_128" type="base64" file="payment_btcpay/static/description/icon.png"/>
         <field name="module_id" ref="base.module_payment_btcpay"/>
-
         <field name="redirect_form_view_id" ref="redirect_form"/>
     </record>
+
 </odoo>