Restructure project and set up Composer (#30)

Implement a new project structure, install Composer, and create
necessary configuration files. Add a logs directory and update
.gitignore for Composer and Visual Studio Code.

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/git,visualstudiocode
+# Edit at https://www.toptal.com/developers/gitignore?templates=git,visualstudiocode
+
+### Git ###
+# Created by git for backups. To disable backups in Git:
+# $ git config --global mergetool.keepBackup false
+*.orig
+
+# Created by git when using merge tools for conflicts
+*.BACKUP.*
+*.BASE.*
+*.LOCAL.*
+*.REMOTE.*
+*_BACKUP_*.txt
+*_BASE_*.txt
+*_LOCAL_*.txt
+*_REMOTE_*.txt
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+.ionide
+
+# End of https://www.toptal.com/developers/gitignore/api/git,visualstudiocode

src/.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/composer
+# Edit at https://www.toptal.com/developers/gitignore?templates=composer
+
+### Composer ###
+composer.phar
+/vendor/
+
+# Commit your application's lock file https://getcomposer.org/doc/01-basic-usage.md#commit-your-composer-lock-file-to-version-control
+# You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
+# composer.lock
+
+# End of https://www.toptal.com/developers/gitignore/api/composer

src/app/Controllers/Controller.php

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+<?php

src/app/Core/Database.php

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+<?php

src/app/Core/Logger.php

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+<?php

src/app/Core/Router.php

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+<?php

src/app/Core/Session.php

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+<?php

src/app/Core/View.php

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+<?php

src/app/Models/User.php

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+<?php

src/app/Views/Home.php

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+<?php

src/bootstrap/app.php

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+<?php

src/composer.json

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+{
+    "name": "projecte-urbantree/urbantree",
+    "description": "Aplicatiu web per la gestió del manteniment d'arbrat urbà i periurbà",
+    "type": "project",
+    "autoload": {
+        "psr-4": {
+            "ProjecteUrbantree\\Urbantree\\": "app/"
+        }
+    },
+    "require": {
+        "vlucas/phpdotenv": "^5.6"
+    }
+}