Add rest-api example (#889)

examples/rest-api/Dockerfile

@@ -0,0 +1,15 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY requirements.txt /app/
+
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . /app
+
+EXPOSE 8000
+
+ENV NAME embedchain
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]