[ADD] estate: Chap 1 - 3. Initial module structure and estate.property model

- Created `__manifest__.py` with module metadata.
- Registered model files in `__init__.py`.
- Added `estate.property` model containing core real estate fields:
  - name, description, postcode, date_availability
  - expected_price, selling_price
  - bedrooms, living_area, facades
  - garage, garden, garden_area, garden_orientation

This provides the foundational data model for the Real Estate application, built as part of Odoo beginner tutorials.

Note:
- Duplicate field definition for `facades` was removed.

Author: aarp-odoo

estate/__init__.py

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+from . import models

estate/__manifest__.py

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+{
+    'name': "Real Estate",
+    'description': """Real Estate Application.""",
+    'summary': """Real Estate Application for beginner.""",
+    'depends': ['base'],
+    'author': "Aaryan Parpyani (aarp)",
+    'category': "Tutorials/RealEstate",
+    'version': '1.0',
+    'application': True,
+    'installable': True,
+}

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
+
+class EstateProperty(models.Model): 
+    _name = "estate.property"
+    _description = "Estate Test"
+
+    name = fields.Char(string="Title")
+    description = fields.Text()
+    postcode = fields.Char()
+    date_availability = fields.Date()
+    expected_price = fields.Float()
+    selling_price = fields.Float()
+    bedrooms = fields.Integer()
+    living_area = fields.Integer()
+    facades = fields.Integer()
+    garage = fields.Boolean()
+    garden = fields.Boolean()
+    garden_area = fields.Integer()
+    garden_orientation = fields.Selection(
+        [
+            ('north', 'North'),
+            ('south', 'South'),
+            ('east', 'East'),
+            ('west', 'West')
+        ],
+        string="Garden Orientation"
+    )