feat: Addition of authentication and user management systems

app/api/v1/schemas/user.py

@@ -0,0 +1,27 @@
+from pydantic import BaseModel, Field, EmailStr, field_validator
+
+
+# ----------------------------------------------------------------------
+# User
+# ----------------------------------------------------------------------
+class UserCreate(BaseModel):
+    username: str = Field(..., min_length=3, max_length=30)
+    email: EmailStr
+    password: str = Field(..., min_length=8)
+
+    @field_validator("username")
+    def all_allowed_chars(cls, v):
+        for v_char in v:
+            if not v_char in "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_":
+                raise ValueError("username can only contain a-z, A-Z, 0-9 and _")
+        return v
+    
+
+class UserRead(BaseModel):
+    id: int
+    username: str
+    email: EmailStr
+    stats: str
+
+    class Config:
+        from_attributes = True