refact:delete .env .DS_Store

frontend/.expo/README.md

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+> Why do I have a folder named ".expo" in my project?
+
+The ".expo" folder is created when an Expo project is started using "expo start" command.
+
+> What do the files contain?
+
+- "devices.json": contains information about devices that have recently opened this project. This is used to populate the "Development sessions" list in your development builds.
+- "packager-info.json": contains port numbers and process PIDs that are used to serve the application to the mobile device/simulator.
+- "settings.json": contains the server configuration that is used to serve the application manifest.
+
+> Should I commit the ".expo" folder?
+
+No, you should not share the ".expo" folder. It does not contain any information that is relevant for other developers working on the project, it is specific to your machine.
+
+Upon project creation, the ".expo" folder is already added to your ".gitignore" file.

frontend/.expo/packager-info.json

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+{
+  "expoServerPort": 19000,
+  "packagerPort": 19000
+}

frontend/.expo/settings.json

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+{
+  "hostType": "lan",
+  "lanType": "ip",
+  "dev": true,
+  "minify": false,
+  "urlRandomness": null,
+  "https": false,
+  "scheme": null,
+  "devClient": false
+}