Add gradio hello world app; add github actions to sync to hub

.github/workflows/hub.yml

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+name: Sync to Hugging Face hub
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  sync-to-hub:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Push to Hugging Face hub
+        env:
+          HF_USERNAME: ${{ secrets.HF_USERNAME }}
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: git push https://$HF_USERNAME:$HF_TOKEN@huggingface.co/spaces/patal-dev/april main

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()