Add CI workflow and build status badge

Introduces a GitHub Actions CI workflow to automate build and test steps for Node.js versions 18.x and 20.x. Updates README to display the build status badge for improved project visibility.

Author: xiyanx

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x]
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Build
+      run: npm run build
+
+    - name: Check build output
+      run: |
+        if [ ! -f dist/index.js ]; then
+          echo "Build failed - dist/index.js not found"
+          exit 1
+        fi
+        echo "Build successful!"

README.md

@@ -1,5 +1,7 @@
 # Mutasiku Discord Bot Example
 
+![Build Status](https://github.com/Mutasiku-ID/node-mutasiku-discord-example/actions/workflows/ci.yml/badge.svg)
+
 Example Discord bot using [mutasiku-sdk](https://github.com/Mutasiku-ID/node-mutasiku-sdk) for payments.
 
 ## Features