Add fastapi to the list of compose projects

* Fastapi base Dockerfile
* requirements.txt for fastapi project
* Add documentation on how to run the application
* Add entrypoint for fastapi application
* Add docker-compose.yml for fastapi
Signed-off-by: vjanz <valon.januzaj98@gmail.com>

fastapi/Dockerfile

+FROM tiangolo/uvicorn-gunicorn-fastapi:python3.9-slim
+
+WORKDIR /app
+
+RUN apt update
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY ./app ./app
+

fastapi/README.md

+## Compose sample application
+### Python/FastAPI application
+
+Project structure:
+```
+├── docker-compose.yaml
+├── Dockerfile
+├── requirements.txt
+├── app
+    ├── main.py
+    ├── __init__.py
+
+```
+
+[_docker-compose.yaml_](docker-compose.yaml)
+```
+services:
+  api:
+    build: .
+    container_name: fastapi-application
+    environment:
+      PORT: 8000
+    ports:
+      - '8000:8000'
+    restart: "no"
+
+```
+
+## Deploy with docker-compose
+
+```shell
+docker-compose up -d --build
+```
+## Expected result
+
+Listing containers must show one container running and the port mapping as below:
+```
+$ docker ps
+CONTAINER ID   IMAGE          COMMAND       CREATED              STATUS              PORTS                                               NAMES
+7087a6e79610   5c1778a60cf8   "/start.sh"   About a minute ago   Up About a minute   80/tcp, 0.0.0.0:8000->8000/tcp, :::8000->8000/tcp   fastapi-application
+```
+
+After the application starts, navigate to `http://localhost:8000` in your web browser and you should see the following json response:
+```
+{
+"message": "OK"
+}
+```
+
+Stop and remove the containers
+```
+$ docker-compose down
+```
+
+

fastapi/app/main.py

+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.get("/")
+def hello_world():
+    return {"message": "OK"}

fastapi/docker-compose.yml

+services:
+  api:
+    build: .
+    container_name: fastapi-application
+    environment:
+      PORT: 8000
+    ports:
+      - '8000:8000'
+    restart: "no"
+

fastapi/requirements.txt

+fastapi
+uvicorn