Create .editorconfig (GeyserMC#4615)

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*]
+charset = utf-8
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+tab_width = 4
+max_line_length = off
+
+[*.java]
+ij_java_class_count_to_use_import_on_demand = 9999
+ij_java_doc_align_exception_comments = false
+ij_java_doc_align_param_comments = false