Functional login and logout, login system should be fucntionally implemented.

Testing and polishing are next.

app/routes/main_routes.py

@@ -1,7 +1,13 @@
 from flask import Blueprint, render_template
+from flask_login  import login_required, current_user
 
 main_bp = Blueprint("main", __name__)
 
 @main_bp.route("/")
 def home():
     return render_template("index.html")
+
+@main_bp.route('/dashboard')
+@login_required
+def dashboard():
+    return render_template('dashboard.html', user=current_user)