chore(common): add an example project

Author: nickchecan

example/my-app/.python-version

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+3.13

example/my-app/README.md

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+---
+applications:
+  - name: my-app
+    memory: 256M
+    disk_quota: 512M
+    instances: 1
+    buildpacks:
+      - https://github.com/NickChecan/uv-python-buildpack
+    random-route: true

example/my-app/manifest.yml

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+[project]
+name = "my-app"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+requires-python = ">=3.13"
+dependencies = [
+    "fastapi>=0.135.3",
+    "uvicorn[standard]>=0.44.0",
+]
+
+[project.scripts]
+start = "my_app.main:start"
+
+[build-system]
+requires = ["uv_build>=0.11.5,<0.12.0"]
+build-backend = "uv_build"

example/my-app/pyproject.toml

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+from fastapi import FastAPI
+import uvicorn
+
+app = FastAPI()
+
+
+@app.get("/")
+def hello_world():
+    return {"message": "Hello, World!"}
+
+def start() -> None:
+    uvicorn.run("my_app.main:app", host="0.0.0.0", port=8000, reload=True)