added workflow to automatically add new PRs to the project

Author: LangChain4j

.github/workflows/add_new_pr_to_project.yaml

@@ -0,0 +1,17 @@
+name: Add new PR to Project
+
+on:
+  pull_request:
+    types:
+      - opened
+      - reopened
+
+jobs:
+  add-to-project:
+    name: Add PR to Project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/add-to-project@v0.5.0
+        with:
+          project-url: https://github.com/users/langchain4j/projects/2
+          github-token: ${{ secrets.GH_TOKEN_ADD_NEW_PRS_TO_PROJECT }}