docs: add some notes for scanner

scie-scanner/README.md

+## vscode-oniguruma parameters
+
+create options:
+
+ - ONIG_OPTION_CAPTURE_GROUP
+ - ONIG_ENCODING_UTF8
+ - ONIG_SYNTAX_DEFAULT
+
+```cpp
+OnigRegExp* createOnigRegExp(unsigned char* data, int length) {
+  OnigRegExp* result;
+  regex_t* regex;
+
+  lastOnigStatus = onig_new(&regex, data, data + length,
+                            ONIG_OPTION_CAPTURE_GROUP, ONIG_ENCODING_UTF8,
+                            ONIG_SYNTAX_DEFAULT, &lastOnigErrorInfo);
+
+  if (lastOnigStatus != ONIG_NORMAL) {
+    return NULL;
+  }
+```
+
+search opions
+
+ - ONIG_REGSET_POSITION_LEAD
+ - ONIG_OPTION_NONE
+
+```cpp
+    bestResultIndex = onig_regset_search(scanner->rset, strData, strData + strLength, strData + position, strData + strLength,
+                                         ONIG_REGSET_POSITION_LEAD, ONIG_OPTION_NONE, &bestLocation);
+
+```
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