feat: initialize theme

assets/.gitignore

@@ -0,0 +1,2 @@
+*.import
+!.gitignore

assets/fonts/variant/font_12.tres

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+[gd_resource type="FontVariation" load_steps=2 format=3 uid="uid://e30wj51bjjjo"]
+
+[ext_resource type="FontFile" uid="uid://jn7m6s3aoe8p" path="res://addons/godot-TBL-extension-base/assets/fonts/source/Cubic_11_1.013_R.ttf" id="1_p3iba"]
+
+[resource]
+base_font = ExtResource("1_p3iba")
+spacing_glyph = 1