Create build.yml

Author: Utkarsh1504

.github/workflows/build.yml

@@ -0,0 +1,14 @@
+name: Build
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - name: Set up JDK 17
+        uses: actions/setup-java@v1
+        with:
+          java-version: 17
+      - run: find . -type f -name "*.java" > sources.txt
+      - run: javac @sources.txt