Create story_text.md

docs/cutscenes/story_text.md

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+# Cutscene Text
+This is the example `story_text.rbrb` from the example stage provided by GemaYue.
+
+```
+English
+//VS RITA
+7
+Ms. Rita?@Is this the end of the example?
+You are right. Before the ending...@Let's try a scroll screen boss battle!@A cut feature during development!
+
+19001
+Welcome to the example map!@Which contain many special trigger events!@You can even customize the character dialog!
+Go to "custom" and@"custom\Erina and the example stage" folders@for more details! 
+Also, by using -debugshowevents as launch options.@You can study more things in this map!
+```
+
+# Format Explanation
+
+The numbers before each cutscene represents the cutscene ID. Each event in the game triggers a different cutscene ID.
+
+The `@` symbol denotes line break within the dialog box.
+
+Each new line creates a new dialog box in the cutscene.