feat(user): adds registration logic and validation

app/users/routes.py

@@ -1,4 +1,5 @@
-from flask import render_template
+from flask import request, render_template
+from app.services.user_service import UserService
 from app.users import bp
 from app.utils.form_errors_dict import FORM_ERRORS
 @bp.route('/')
@@ -9,6 +10,8 @@ def index():
 def login():
     return render_template("users/login.html")
 
-@bp.route('/register')
+@bp.route('/register', methods=["GET", "POST"])
 def register():
+    if request.method == 'POST':
+        UserService.register_user(request.form)
     return render_template("users/register.html", FORM_ERRORS=FORM_ERRORS)