Configure project settings and import assets

This commit sets up the initial project configuration including: -
Window size and scaling settings - Input mappings for player controls -
Default texture filtering settings - Import of game asset pack with
sprites and UI elements - Set of signals for tracking player bullets

scenes/start.tscn

@@ -0,0 +1,9 @@
+[gd_scene format=3 uid="uid://ssdtocwmj0wj"]
+
+[node name="Start" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2