exits if user types nothing (resolves#2)

.github/workflows/compile.yml

@@ -0,0 +1,24 @@
+name: compile
+
+on:
+  pull_request:
+    branches: [ main ]
+  push:
+    branches: [ branch ]
+
+jobs:
+  install:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y -f build-essential g++ cmake
+
+  build:
+    needs: install
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Compile project
+        run: g++ -std=c++17 main.cpp -o app

README.md

@@ -1,3 +1,5 @@
+[![Compile CI](https://github.com/laurunion/autovalidate/actions/workflows/compile.yml/badge.svg)](https://github.com/laurunion/autovalidate/actions/workflows/compile.yml)
+
 # autovalidate
 
 I like that app too!