[ADD] estate: create an estate app

- Created an estate application for odoo
- Added some basic models and fields
- Added security for the models
- Added menu, basic views (Form and List)

estate/__init__.py

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+from . import models

estate/__manifest__.py

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+{
+    "name":'estate',
+    "summary": "An estate app",
+    'depends': [
+        'base'
+    ],
+    'data':[
+        'security/ir.model.access.csv',
+        'views/estate_property_views.xml',
+        'views/estate_menus.xml'
+    ],
+    'installable': True,
+    'application': True,
+    "license":"LGPL-3"
+}

estate/models/__init__.py

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+from . import estate_property

estate/models/estate_property.py

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+from odoo import fields,models
+from datetime import datetime, timedelta
+
+class EstateProperty(models.Model):
+    _name = "estate.property"
+    _description =" Good real estate"
+
+    name= fields.Char(required=True)
+    description=fields.Text()
+    postcode=fields.Char()
+    date_availability = fields.Date(default= datetime.now() + timedelta(days=90))
+    expected_price=fields.Float(required=True)
+    selling_price=fields.Float(readonly=True)
+    bedrooms=fields.Integer(default=2)
+    living_area=fields.Integer()
+    facades=fields.Integer()
+    garage= fields.Boolean()
+    garden= fields.Boolean()
+    garden_area=fields.Integer()
+    garden_orientation= fields.Selection(string='Garden orientation',
+        selection=[
+            ('North', 'North'),
+            ('West', 'West'),
+            ('South', 'South'),
+            ('East', 'East')
+        ]
+    )
+    active = fields.Boolean('Active', default=False)
+    state= fields.Selection(selection=[('new','New'),('offer received','Offer Received'),('offer accepted','Offer Accepted'),('sold','Sold'), ('cancelled','Cancelled')],required=True, default='New',copy=False)

estate/security/ir.model.access.csv

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+id,name,model_id/id,group_id/id,perm_read,perm_write,perm_create,perm_unlink
+access_estate_property,estate_property,model_estate_property,base.group_user,1,1,1,1

estate/views/estate_menus.xml

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+<odoo>
+    <menuitem id="estate_property_menu_root" name="Real estate">
+        <menuitem id='estate_property_first_level_menu' name='First level'>
+            <menuitem id ='estate_property_menu_action' action='test_estate_property'/>
+        </menuitem>
+    </menuitem>
+</odoo>

estate/views/estate_property_views.xml

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+<?xml version="1.0"?>
+<odoo>
+    <record id="test_estate_property" model="ir.actions.act_window">
+        <field name="name">estate</field>
+        <field name="res_model">estate.property</field>
+        <field name="view_mode">list,form</field>
+    </record>
+</odoo>
+