set up GitHub Actions and add a simple gradio app

.github/workflows/push_to_hf_space.yml

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+name: Sync with Hugging Face Hub
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Sync with Hugging Face
+      uses: nateraw/huggingface-sync-action@v0.0.4
+      with:
+        github_repo_id: othmanreem/Data-intensive-systems
+        huggingface_repo_id: lnuDataProject/A1
+        repo_type: space
+        space_sdk: gradio
+        hf_token: ${{ secrets.HF_TOKEN }}

app.py

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+import gradio as gr
+
+def greet(name):
+    return "Hello " + name + "!!"
+
+iface = gr.Interface(fn=greet, inputs="text", outputs="text")
+iface.launch()