docs: add README.md

Author: High10Hunter

README.md

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+<p align="center">
+    <h1 align="center">SafeAlert 🚨</h1>
+  </a>
+</p>
+
+<p align="center">
+    <img src="https://i.ibb.co/3kRpTnt/image-10.jpg" alt="ava" border="0" width="300px">
+</p>
+<!-- Here is app icon placeholder -->
+
+> SafeAlert - A mobile app designed to deliver prompt assistance from volunteers nearby, providing effective solutions for unexpected incidents.
+
+This project will join [GDSC Solution Challenge 2024](https://developers.google.com/community/gdsc-solution-challenge).
+
+## Technology used ✨
+
+-   [Flutter & Dart](https://flutter.dev/)
+-   [Google Map Platform](https://mapsplatform.google.com/)
+-   [Firebase](https://firebase.google.com/)
+-   [NodeJs](https://nodejs.org/en)
+
+</details>
+
+## Setup and run
+
+<details>
+    <summary>Click to expand</summary>
+    <br>    
+    <h3>Clone the repo</h3>
+
+```sh
+git clone https://github.com/dscdut/safe-alert
+```
+
+   <h3>Backend</h3>
+
+1. Prerequisites
+
+-   Install node
+    <https://nodejs.org/en/download/>
+
+-   Install yarn
+
+```sh
+npm install --global yarn
+```
+
+2. Install NPM packages
+
+```sh
+cd backend
+# run database migrations and seeds
+npm run db:reset
+yarn install
+```
+
+3. Run the development server:
+
+```bash
+yarn start
+```
+
+4. Open [http://localhost:3000](http://localhost:3000).
+
+ <h3>Mobile</h3>
+  
+ 1. Change directory:
+  
+ ```bash
+  cd ..
+  cd mobile
+ ```
+  
+ 2. Get the dependencies:
+  
+ ```bash
+ flutter pub get
+ ```
+  
+ 3. Start build APK release file:
+  
+ ```bash
+ flutter build apk --release -t lib/main_staging.dart --flavor=staging
+ ```
+
+<!-- - Download APK
+  - [APK - arm64](https://drive.google.com/file/d/1r5BxLCoTn2JqQuEjAtoUxmZeSHIByEKa/view?usp=sharing)
+- Setup and run
+  - Flutter
+    - Install [Flutter](https://flutter.dev/docs/get-started/install).
+    - Using **`stable`** channel:
+      ```bash
+      ❯ flutter channel stable
+      ❯ flutter upgrade
+      ```
+    - Flutter doctor:
+      ```bash
+      ❯ flutter doctor
+      ```
+    - Install all the packages by:
+      ```bash
+      ❯ flutter pub get
+      ```
+    - Create .env file `assets/.env` has following structure:
+      ```bash
+      BASE_URL=https://api.smartfood.cooking/api
+      ```
+    - Run app on real devices or emulator by:
+      ```bash
+      ❯ flutter run
+      ```
+      or debug mode in VSCode or some IDEs -->
+
+</details>