docs: update README, add some more jsdoc

organizers/by_character.ts

@@ -1,3 +1,14 @@
+/**
+ * FSDB Organizer: By Character
+ *
+ * Organizes by splitting a string up and using the characters
+ * for folders, eg:
+ *
+ * abcdefg.json => /a/ab/abc/abcdefg.json
+ *
+ * @module
+ */
+
 import sanitize from '../utils/sanitize.ts';
 
 export default function by_character(value: string): string[] {