Add GET and POST endpoints

.gitignore

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+/.idea
+/__pycache__
+/venv

main.py

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+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel, Field
+
+wsd_app = FastAPI()
+
+user_list = [
+    {
+        'mail': 'abc@yandex.ru',
+        'password': 'abc_pwd'
+    },
+    {
+        'mail': 'qwerty@gmail.com',
+        'password': 'qwerty'
+    }
+]
+
+
+@wsd_app.get("/statistics/")
+async def get_statistics(indicator: str):
+    if indicator == "num_of_users":
+        return {'number of users': len(user_list)}
+    raise HTTPException(status_code=404, detail="Don't know this indicator")
+
+
+class User(BaseModel):
+    mail: str = Field(..., regex=r".+@.+\..+")
+    password1: str
+    password2: str
+
+
+@wsd_app.post("/registration/", status_code=201)
+async def create_account(user: User):
+    if user.mail in [d['mail'] for d in user_list]:
+        raise HTTPException(status_code=403, detail="This mail has been already registered")
+    if user.password1 != user.password2:
+        raise HTTPException(status_code=403, detail="Passwords don't match")
+    user_list.append({'mail': user.mail, 'password': user.password1})
+    return "Account is created"