Add Apprentice theme (#5)

* add Apprentice theme

* update Apprentice completion colors

Apprentice.tet

@@ -0,0 +1,48 @@
+[color_theme]
+
+symbol_color="ffbcbcbc"
+keyword_color="ff8fafd7"
+
+base_type_color="ff8787af"
+engine_type_color="ff8787af"
+user_type_color="ff8787af"
+
+comment_color="ff6c6c6c"
+string_color="ff87af87"
+background_color="ff262626"
+
+completion_background_color="ff444444"
+completion_selected_color="ff6c6c6c"
+completion_existing_color="595fafaf"
+completion_scroll_color="ff6c6c6c"
+completion_font_color="ffbcbcbc"
+
+text_color="ffbcbcbc"
+line_number_color="ff444444"
+safe_line_number_color="595f875f"
+
+caret_color="ff5fafaf"
+caret_background_color="ff444444"
+
+text_selected_color="ffcccccc"
+selection_color="3000c3ff"
+brace_mismatch_color="ffff3333"
+current_line_color="0bffffff"
+line_length_guideline_color="ff444444"
+
+word_highlighted_color="1affffff"
+
+number_color="ffffffaf"
+function_color="ffffffff"
+member_variable_color="ffbcbcbc"
+
+mark_color="38ff3232"
+bookmark_color="ff87af87"
+breakpoint_color="ffff8700"
+code_folding_color="ff6c6c6c"
+
+search_result_color="595fafaf"
+search_result_border_color="00000000"
+
+gdscript/function_definition_color="ffffffaf"
+gdscript/node_path_color="ff5fafaf"