added FastApi Doc

Docs/Services/FastAPI/01-Setup.md

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+```bash
+python3 -m venv .venv
+```
+
+
+```bash
+pip install fastapi
+```
+
+```bash
+pip freeze > requirment.txt
+```

Docs/Services/FastAPI/02-Simple-Route.md

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+```python
+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.get("/")
+def home_dir():
+    return {"message": "Home Pag"}
+```
+
+```bash
+fastapi dev main.py
+```
+use uvicorn as defualt runner 
+or
+we can run with uvicorn command
+```bash
+uvicorn main:app --reload --host 0.0.0.0 --port 1234
+```
+

Docs/Services/FastAPI/03-Get-Post-Json.md

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+```python
+
+from fastapi import FastAPI
+
+app = FastAPI()
+
+users = [
+    {'name': 'abbas ' , 'age': '20'},
+    {'name': 'mmd ' , 'age': '37'},
+    {'name': 'asghar ' , 'age': '19'}
+]
+
+@app.get("/")
+def root_dir:
+    return {'message' , 'api is working'}
+
+@app.get("/users")
+def home_dir():
+    return users
+
+@app.get("/user/{name_input}")
+def read_item(name_input: str):
+   for item in users:
+        if item["name"] == name_input:
+            return {"information": item}
+    return {"message" , "not worked"}
+```