Create gh action - format (#17)

Co-authored-by: AngeloTadeucci <AngeloTadeucci@users.noreply.github.com>

.github/workflows/prettier.yml

@@ -0,0 +1,21 @@
+name: Prettier
+on:
+    pull_request:
+        branches: [main]
+jobs:
+    format:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+              with:
+                  ref: ${{ github.head_ref }}
+            - uses: actions/setup-node@v1
+              with:
+                  node-version: "18.x"
+            - run: npm ci
+            - run: npm run prettier
+            - name: Commit changes
+              uses: stefanzweifel/git-auto-commit-action@v4.1.2
+              with:
+                  commit_message: Apply prettier changes
+                  branch: ${{ github.head_ref }}