github_actions: Add workflows.

Added workflows for CI/CD, eslint and prettier.

.github/workflows/eslint.yml

@@ -0,0 +1,52 @@
+name: ESLint
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  eslint-backend:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '20'
+
+    - name: Install backend dependencies
+      working-directory: ./backend
+      run: npm install
+
+    - name: Run backend lint
+      working-directory: ./backend
+      run: npm run lint
+
+  eslint-frontend:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '20'
+
+    - name: Install frontend dependencies
+      working-directory: ./frontend
+      run: npm install
+
+    - name: Run frontend lint
+      working-directory: ./frontend
+      run: npm run lint

.github/workflows/main.yml

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+name: CI/CD Pipeline
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    services:
+      mongo:
+        image: mongo:latest
+        ports:
+          - 27017:27017
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '20'
+
+    - name: Install backend dependencies
+      working-directory: ./backend
+      run: npm install
+
+    # - name: Run backend tests
+    #   working-directory: ./backend
+    #   run: npm test
+
+    - name: Install frontend dependencies
+      working-directory: ./frontend
+      run: npm install
+
+    # - name: Run frontend tests
+    #   working-directory: ./frontend
+    #   run: npm test
+
+    - name: Build frontend
+      working-directory: ./frontend
+      run: npm run build

.github/workflows/prettier.yml

@@ -0,0 +1,52 @@
+name: Prettier
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  prettier-backend:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '20'
+
+    - name: Install backend dependencies
+      working-directory: ./backend
+      run: npm install
+
+    - name: Run backend format check
+      working-directory: ./backend
+      run: npm run format
+
+  prettier-frontend:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '20'
+
+    - name: Install frontend dependencies
+      working-directory: ./frontend
+      run: npm install
+
+    - name: Run frontend format check
+      working-directory: ./frontend
+      run: npm run format

backend/.eslintrc.json

@@ -0,0 +1,24 @@
+{
+  "env": {
+    "browser": true,
+    "es2021": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:react/recommended"
+  ],
+  "parserOptions": {
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "ecmaVersion": 12,
+    "sourceType": "module"
+  },
+  "plugins": [
+    "react"
+  ],
+  "rules": {
+    // Add your custom rules here
+  }
+}

backend/.prettierrc

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+{
+    "singleQuote": true,
+    "trailingComma": "es5",
+    "tabWidth": 4,
+    "semi": true
+}