Add PayDunya payment provider integration

- Implemented PayDunya payment provider with necessary models, controllers, and views.
- Added configuration files for Docker and Odoo setup.
- Included .gitignore for Python and Odoo specific files.

addons/payment_paydunya/views/payment_paydunya_templates.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+  <template id="paydunya_redirect_form">
+    <t t-call="website.layout">
+    <div class="container my-5">
+    <div class="oe_paydunya_redirect">
+    <h3>Redirection vers PayDunya...</h3>
+    
+              <form id="paydunya_redirect_form" t-att-action="redirect_url" method="post">
+    <input type="hidden" name="token" t-att-value="paydunya_token"/>
+    <noscript>
+    <button type="submit" class="btn btn-primary">Payer</button>
+    </noscript>
+    </form>
+    
+              <t t-if="redirect_url">
+    <script type="text/javascript">
+                  (function () {
+                    const f = document.getElementById('paydunya_redirect_form');
+                    if (f) { f.submit(); }
+                  })();
+    </script>
+    </t>
+    
+            </div>
+    </div>
+    </t>
+  </template>
+</odoo>

addons/payment_paydunya/views/payment_paydunya_views.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+  <!-- Form view for PayDunya payment provider -->
+  <record id="payment_provider_paydunya_form" model="ir.ui.view">
+    <field name="name">payment.provider.paydunya.form</field>
+    <field name="model">payment.provider</field>
+    <field name="inherit_id" ref="payment.payment_provider_form"/>
+    <field name="arch" type="xml">
+      <xpath expr="//page[@name='credentials']" position="inside">
+        <group id="paydunya_credentials" invisible='code != "paydunya"'>
+          <h2>PayDunya Credentials</h2>
+          <field name="environment"/>
+          <field name="paydunya_master_key" password="True"/>
+          <field name="paydunya_public_key"/>
+          <field name="paydunya_private_key" password="True"/>
+          <field name="paydunya_token" password="True"/>
+        </group>
+      </xpath>
+    </field>
+  </record>
+</odoo>