docs: create roadmap file (#58)

Author: MessiasLima

docs/roadmap.md

@@ -0,0 +1,13 @@
+# 🛤️ Roadmap
+
+We have several improvements and features to be added to the GameOutlet. Here are the things that we want to implement
+in a near future:
+- [x] **Latest deals:** Show the latest deals in the home screen.  
+- [x] **Game search:** Search by your favourite games
+- [ ] **Windows version:** Game Outlet fully functional in windows hosts
+- [ ] **Wishlist:** Mark a game as favourite and easily get back to it to see its prices
+- [ ] **Stores:** Show the list of available stores and show the deals from this store
+- [ ] **Theme selection:** Select users preferred theme from the settings section
+- [ ] **Alerts:** Get a notification when a favourite game's price drops
+
+New ideas are always welcome. Feel free to use the [discussions section](https://github.com/AppOutlet/GameOutlet/discussions) to suggest more!