added workflow for PR validation (#40)

diff --git a/.github/workflows/pr-validation.yml b/.github/workflows/pr-validation.yml
new file mode 100644
index 0000000..5bc6303
--- /dev/null
+++ b/.github/workflows/pr-validation.yml
@@ -0,0 +1,27 @@
+name: validate-pr
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: '14.x'
+
+      - name: Build website
+        run: |
+          npm install
+          npm run build-website
+
+      - name: Build documentation
+        run: |
+          cd documentation/website
+          npm install
+          npm run build
\ No newline at end of file