Resolve "creating database flask-sqlalchemy"

Closes #3 (closed)

src/main.py

 from flask import Flask, request
 from flask_restful import Api, Resource
 import os.path
+from datetime import datetime
+
+from flask_sqlalchemy import SQLAlchemy
 
 app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db'
+db = SQLAlchemy(app)
 api = Api(app)
 
 
+class User(db.Model):
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    name = db.Column(db.String(255), nullable=False)
+    email = db.Column(db.String(255), nullable=False)
+    pwd = db.Column(db.String(255), nullable=False)
+
+
+class Salamander(db.Model):
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    sex = db.Column(db.String(255), nullable=False)
+    species = db.Column(db.String(255), nullable=False)
+    location = db.Column(db.String(255), nullable=False)
+    location_id = db.Column(db.Integer, db.ForeignKey('location.id'), nullable=False)
+    image_path = db.Column(db.String(255), nullable=False)
+    uid = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
+    date = db.Column(db.DateTime, default=datetime.now)
+
+
+class Location(db.Model):
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    name = db.Column(db.String(255), nullable=False)
+    coordinates = db.Column(db.String(255), nullable=False)
+    pwd = db.Column(db.String(255), nullable=False)
+    radius = db.Column(db.Integer, nullable=False)
+
+
+# matchSalamander endpoint
 class MatchSalamander(Resource):
     @staticmethod
     def post():
@@ -40,6 +72,7 @@ class MatchSalamander(Resource):
         return output
 
 
+# findSalamanderInfo endpoint
 class FindSalamanderInfo(Resource):
     @staticmethod
     def post():
@@ -63,7 +96,6 @@ def get_path(data, end_directory):
 
 def directory_not_empty(directory_path):
     if os.path.exists(directory_path) and not os.path.isfile(directory_path):
-
         # Checking if the directory is empty or not
         if not os.listdir(directory_path):
             return False